Saturday, May 31, 2025

Global Strategies and Local Impacts of Methane Emissions

 



Methane is a potent greenhouse gas contributing to climate change. It is the second most prevalent greenhouse gas after carbon dioxide. Methane emissions are primarily from agriculture, fossil fuels, and waste management. Understanding these emissions is essential for effective climate action.

Sources of Methane Emissions

Methane is produced from both natural and human activities. Natural sources include wetlands, termites, and wildfires. Human activities contribute about 60% of global methane emissions. Agriculture is the largest contributor, accounting for 40%. This includes emissions from livestock and rice cultivation. The fossil fuel sector follows with 35%, while waste management contributes 20%.

Global Initiatives for Mitigation

Efforts to mitigate methane emissions have been ongoing since the 1992 UN Framework Convention on Climate Change. The Kyoto Protocol, adopted in 1997, included methane as one of the six greenhouse gases with binding targets for developed countries. The Paris Agreement in 2015 shifted to a voluntary approach but still emphasised the need for developed countries to lead in emissions reductions.

The Global Methane Pledge

At COP 26, the Global Methane Pledge was launched. This initiative aims to reduce global methane emissions by at least 30% from 2020 levels by 2030. The United Nations Environment Programme supports this with initiatives like the International Methane Emission Observatory. This observatory enhances global reporting on methane emissions.

Technological Innovations and Solutions

The Global Methane Initiative promotes collaboration to reduce emissions. It works with various international agencies to raise awareness and mobilise investments. Events like the Methane Mitigation Summit facilitate knowledge-sharing on innovative solutions for reducing emissions, particularly in the energy sector.

India’s Approach to Methane Emissions

India has not signed the Global Methane Pledge due to concerns about its impact on food security and farmers’ incomes. Major sources of methane in India include livestock and rice cultivation. The government promotes practices to reduce methane emissions under the National Mission for Sustainable Agriculture. These include crop diversification and improved livestock management.

Economic Considerations in Methane Reduction

Reducing methane emissions is crucial for addressing global warming. However, it poses challenges for developing countries like India, where emissions are linked to food security. Climate finance from developed nations is essential for supporting ambitious actions in developing countries. The energy sector offers immediate opportunities for cost-effective methane reduction, making it a priority area for action.

Future Directions and Challenges

The upcoming Methane Mitigation Summit aims to accelerate action in the energy sector. Success in this area could lead to broader efforts across other sectors. Addressing methane emissions requires coordinated international efforts and sector-specific strategies to balance economic and environmental goals

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Friday, May 30, 2025

RBI Moves to Internationalise INR

 



The Reserve Bank of India (RBI) is making strides towards internationalising the Indian Rupee. Recently, the RBI sought approval from the Government of India to allow domestic banks to lend rupees to overseas borrowers. This initiative aims to enhance the use of the rupee in international trade, particularly with neighbouring countries.

Proposal

The RBI’s proposal suggests that domestic banks and their foreign branches lend in rupees to non-residents. Initially, this would focus on neighbouring countries such as Bangladesh, Bhutan, Nepal, and Sri Lanka. If successful, this could eventually extend to global cross-border transactions. Currently, Indian banks can only provide loans in foreign currencies, primarily to Indian firms.

Trade Context

In the fiscal year 2024-25, India’s exports to South Asia amounted to approximately $25 billion. Notably, 90% of these exports were directed towards Bangladesh, Bhutan, Nepal, and Sri Lanka. This marks the potential market for rupee-denominated lending in these regions.

Strategic Steps by RBI

Over recent years, the RBI has implemented various measures to promote the rupee in foreign transactions. The central bank has allowed non-residents to open rupee accounts outside India. Furthermore, it has sought to remove caps on foreign banks with vostro accounts buying short-term sovereign debt. These steps aim to boost rupee-denominated investments and trade.

Current Lending Restrictions

At present, the foreign branches of Indian banks are limited to providing loans in foreign currencies. This restriction hampers the potential for rupee transactions in international trade. The proposed lending in rupees aims to facilitate trade settlements and reduce exposure to foreign exchange volatility.

Reducing Reliance on Government Support

Currently, rupee liquidity in other countries is available only through a limited number of government-backed credit lines or bilateral currency swap arrangements. The RBI’s objective is to reduce this dependence and allow commercial banks to provide rupee liquidity based on market conditions.

Previous Initiatives

India has previously entered into local currency agreements with countries like the United Arab Emirates, Indonesia, and the Maldives. These agreements have demonstrated the feasibility of increasing transactions in local currencies, including the Indian Rupee. The RBI’s recent moves are part of a broader strategy to deepen the availability of rupee liquidity in international markets.


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Thursday, May 29, 2025

Globally Important Agricultural Heritage Systems

 



The recent designation of new Globally Important Agricultural Heritage Systems (GIAHS) marks the importance of traditional farming practices. These systems are recognised for their role in preserving biodiversity and cultural heritage while adapting to climate change. The Food and Agriculture Organization (FAO) has expanded its GIAHS network to 95 systems across 28 countries. This initiative aims to showcase sustainable agricultural practices that have thrived for generations.

What Are GIAHS?

GIAHS are unique agricultural systems that blend traditional knowledge with sustainable practices. They maintain biodiversity and cultural identity. The FAO established this programme to protect these systems from modern agricultural pressures. GIAHS exemplify sustainable farming techniques that can inform global agricultural policies.

Recent Additions to GIAHS

The latest additions include systems from Brazil, China, Mexico, and Spain. Each system reflects local environmental conditions and cultural practices. These systems are crucial for food security and ecological balance. They demonstrate how communities can use ancestral knowledge to face modern challenges.

Erva-Mate Agroforestry in Brazil

In southern Brazil, the erva-mate plant is cultivated in shaded agroforestry systems. This practice supports biodiversity and cultural identity. It helps conserve the endangered Araucaria Forest. The system integrates food crops and forest products, promoting food sovereignty.

Deqing Freshwater Pearl Mussels in China

Zhejiang Province features a unique fish-mussel co-cultivation system. This system has been in practice for over 800 years. It combines aquaculture with agriculture, producing pearls, rice, and silk. The method enhances biodiversity and reduces water pollution, benefiting local communities.

Fuding White Tea in China

Fuding is known for its centuries-old white tea cultivation. The system integrates tea gardens with forests and crops. It preserves various tea tree varieties and supports local livelihoods. This agricultural practice showcases a deep cultural connection to the land.

Gaolan Shichuan Pear Orchard in China

The Gaolan Shichuan system is over 600 years old. It thrives in the arid Loess Plateau region. Farmers use traditional methods to cultivate ancient pear varieties. This system contributes to food security and conserves agrobiodiversity.

Metepantle System in Mexico

In Tlaxcala, the Metepantle system has been practised for over 3,000 years. It features terraced farming of maize, beans, and squash. This system preserves native species and supports local food systems. It exemplifies resilience in climate-vulnerable regions.

Lanzarote Agricultural Systems in Spain

Lanzarote’s agricultural system utilises volcanic soil to cultivate crops. Farmers use innovative techniques to trap moisture and regulate soil temperature. This method sustains biodiversity in one of Europe’s driest regions. It showcases the adaptability of traditional farming practices.



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Wednesday, May 28, 2025

Tianwen-2 Mission

 






China is set to launch its first mission to survey and sample a near-Earth asteroid this week. The Tianwen-2 mission aims to explore 469219 Kamo‘oalewa, a unique asteroid that orbits the Sun close to Earth. This mission places China among a select group of countries capable of sampling and returning materials from asteroids, joining the ranks of the United States and Japan.



Overview of the Tianwen-2 Mission

The Tianwen-2 mission represents step for China’s space exploration programme. It will investigate Kamo‘oalewa, a quasi-satellite that exhibits unusual orbital characteristics. The mission’s primary goal is to gather samples that could provide vital information about the origins of this asteroid and its potential link to the Moon.

What is Kamo‘oalewa?

Kamo‘oalewa was discovered in 2016 by the Pan-STARRS 1 telescope in Hawaii. It is classified as a quasi-satellite of Earth, meaning it orbits the Sun while being influenced by Earth’s gravity. Kamo‘oalewa has a highly elliptical orbit and has been in its current position for about 100 years, with expectations to remain there for another 300 years.

Scientific Significance of Kamo‘oalewa

The asteroid has attracted attention due to its potential composition and origin. Some scientists speculate that it may be composed of lunar material, possibly ejected from the Moon following a collision. This theory is supported by spectral data indicating similarities to lunar samples collected during the Apollo missions. Understanding Kamo‘oalewa could shed light on the formation of the Moon and the dynamics of quasi-satellites.

Sample Collection Techniques

The Tianwen-2 mission will employ a “touch-and-go” method for sample collection. This involves the spacecraft hovering near the asteroid’s surface while a robotic arm releases a burst of gas to dislodge fragments. Additionally, an “anchor and attach” technique may be used, where robotic arms drill into the asteroid to retrieve material. The collected samples will be returned to Earth for analysis.

Challenges Ahead


Collecting samples from Kamo‘oalewa poses unique challenges. The asteroid’s small size, measuring only 40 to 100 metres in diameter, complicates the collection process. The mission will require advanced technology, including sophisticated cameras and control systems, to navigate the asteroid’s surface effectively.

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Tuesday, May 27, 2025

Land Surface Temperature

 



Recent studies highlight the critical role of Land Surface Temperature (LST) in understanding climate dynamics in Jalna, Maharashtra. This drought-prone district has faced extreme temperatures, especially during drought years. Research indicates a strong correlation between rainfall and LST, emphasising the need for effective climate adaptation strategies.

About Land Surface Temperature (LST)

LST measures how warm or cold the Earth’s surface is. It varies seasonally and is influenced by energy and water exchanges between the land and atmosphere. LST is crucial for assessing plant growth, crop health, and water stress. High LST can indicate environmental challenges requiring immediate attention.

Impact of Rainfall on LST

Research shows relationship between rainfall and LST. Years with adequate rainfall experience lower surface temperatures. Conversely, drought years lead to extreme heat. This correlation underlines the importance of seasonal rainfall in mitigating heat events in Jalna.

Localised Interventions for Climate Adaptation

The study advocates for integrating LST monitoring into rural development policies. Suggested interventions include afforestation, climate-resilient agriculture, and water conservation. These measures can help lower LST, enhance soil health, and improve livelihoods.

Changes in Land Use Patterns

Land use in Jalna has evolved, with intensified farming practices leading to increased fallow land usage. The extensive application of chemical fertilisers has affected soil health. While vegetation cover has seen a slight increase due to conservation efforts, the conversion of land for agriculture remains a concern.

Challenges Faced by Farmers

Farmers in Jalna struggle with erratic rainfall patterns. Delayed monsoons affect crop planting schedules, resulting in financial losses. Experts recommend adopting climate-resilient farming practices and relying on accurate weather forecasts to mitigate risks.
Looking Ahead – Vision for 2047

The study aims to establish a vision for Jalna by 2047. It emphasises the need for strategic activities in villages to combat climate change. Successful watershed development initiatives in other districts provide a model for sustainable practices in Jalna.

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Friday, May 16, 2025

Active Galactic Nuclei

 



Recent investigations by astronomers from the Russian Academy of Sciences using the Spektr-RG (SRG) space observatory have led to the identification of 11 new active galactic nuclei (AGNs). AGNs are regions at the centre of galaxies that emit immense amounts of light and energy, often due to black holes or intense star formation.

About Active Galactic Nuclei (AGNs)

AGNs are among the most luminous sources of electromagnetic radiation in the universe. They are characterised by their brightness and energy, which surpass that of the surrounding galaxy. The light emitted by AGNs comes from dust and gas swirling around a supermassive black hole or intense star formation. Their study provides vital information about galaxy evolution and the behaviour of matter in extreme conditions.

The Role of Seyfert Galaxies

The newly identified AGNs are classified as Seyfert galaxies. Seyfert galaxies are a type of AGN that appear similar to regular galaxies in visible light but emit infrared radiation. They are divided into two main types – Type 1 Seyfert galaxies have broad optical emission lines, while Type 2 Seyfert galaxies exhibit narrower lines. The identification of these AGNs contributes to the understanding of galaxy types and their characteristics
.
Findings from the SRG Observations

The research team used the ART-XC telescope to explore both new and previously known X-ray sources. They reported discovering over 50 AGNs, with the latest findings comprising 11 new AGNs. The redshifts of these newly identified AGNs range from 0.028 to 0.258, indicating they are relatively nearby in cosmic terms. Their X-ray luminosities vary from 2 to 300 tredecillion erg/s, typical for AGNs.

Black Hole Masses and Characteristics

The study also calculated the masses of black holes in seven of the Seyfert galaxies. These masses ranged from 4.68 to 150 million solar masses. This measurement is crucial for understanding the relationship between black hole mass and the properties of host galaxies. The spectrum of one AGN, SRGA J000132.9+240237, suggested strong absorption and radiation reflection from the galaxy’s dusty torus, necessitating further observation.

Future Research Directions

The researchers noted the need for longer X-ray observations to better understand the physical properties of the new AGNs. They plan to conduct higher-quality X-ray spectral studies using the SRG/ART-XC telescope. This continued research aims to deepen our knowledge of AGNs and their role in the universe.

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Tuesday, April 22, 2025

Bridging the agritech divide with advanced farming technology

 

Bridging the agritech divide with advanced farming technology

Bridging the agritech divide with advanced farming technology

As the agriculture sector stands at a crossroads, scalable innovations like satellite-based sensing, region-specific tools, and inclusive pricing models offer a path toward a more sustainable and tech-enabled agricultural future

The farming industry is one of the significant pillars of the Indian economy, contributing a significant 16 per cent of India’s GDP and engaging more than half of the country’s population. However, to date, there has been a slow uptake of advanced technologies in agriculture. While several agritech start-ups have been launched and well-funded by investors, the connection between these ventures and farmers remains a challenge. One of the main problems that these start-ups have to contend with is that of high costs, which tend to be associated with technology.

There are many tools — including those used in precision farming, machinery such as weather stations, and sensors that can be applied to the soil — that hold the future of increased yields and sustainable farming. However, the cost associated with such technologies might be unaffordable for small farmers, who form the largest percentage of India’s farming community. Devices such as IoT sensors can cost hundreds of dollars per year, meaning that while a slight increase in yield for such farmers is hard to come by, the devices do not offer value for money.

More than 80 per cent of farmers in India are marginal farmers, cultivating landholdings of less than five acres. These marginal lands are often fragmented into multiple smaller plots, allowing farmers to grow different crops on the same holding.

This fragmentation poses a challenge for agritech solutions designed for large-scale farming. However, satellite-based data solutions can bridge this gap by providing precise, farm-specific insights even for farms having an area of only a quarter of an acre (about 10,000 square feet), enabling even smallholder farmers to optimise their crop management and improve productivity.

The policies of the Indian agricultural sector fluctuate, and some crucial aspects like water — which is a basic necessity for agriculture — are controlled by the state governemnt.

While such interventions as subsidies and grants are useful, they have led to a situation where agritech remains a state-subsidised model rather than a market-driven one.

Many new agritechs have come to depend on these Governemnt partnerships for revenue instead of selling directly to farmers, which has impacted the growth and sustainability of most of them in the private market.

Among the challenges that have limited the embrace of agritech is ignorance among farmers.

It is essential to understand that large-scale farmers might invest time and resources to evaluate and consider adopting new technologies, while smallholder farmers are more likely to make decisions by word of mouth or based on regular practices.

This is mainly due to the poor development of facilities and capacity-building to form the basis for adopting innovations in farming technologies.

Cost-Effective Solutions

The first area of intervention for farmer uptake can be increased through improved adoption of technologies that are cheaper to develop. Although IoT-based sensors are costly, satellite remote sensing is feasible.

While IoT sensors can cost several hundred dollars and give localised information, satellite technology offers information for the whole farm area at a considerably lower cost — usually less than 5 per cent of the price of sensors. Satellite remote sensing, combined with artificial intelligence and machine learning, can be used to monitor soil nutrient levels, manage pest and disease risks, and support irrigation water management across large areas of farmland.

 These solutions are especially practical and accessible for smallholder farmers. In this way, satellite-based solutions represent a constrained set of technological tools whereby agritech companies can propose complete and high-quality products and services at more competitive prices.

localised Solutions

Given the highly heterogeneous climate of the country and the different farming practices followed across regions, it can be said that a market solution carved in one casting will not fit this agritech market. Start-ups must provide region-specific products.

They can, therefore, apply different ways of ensuring their solution reaches farms in varying regions so that farmers can adopt it.

Pricing Models

Long-term, technology must be accessible to small and marginal farmers and useful even for field crops like wheat —especially in terms of the ultimate cost of the technology delivered to the farm. A scholar cited that the cost of any new technology farmers must consider has to be less than or equal to 10 per cent of the total farming cost. This is crucial for adoption.

Affordability is another value that agritech start-ups should embrace, enabling them to offer their products at a cheaper cost and within reach of many farmers. Other revenue models that can be used include fee-for-service or usage plans in which the farmer pays only for what is used.

Fostering Education

Guaranteeing extensive use of such technology — even if it is cheap— requires more education and support. Agritech companies must incorporate education campaigns as a key means of informing farmers about the benefits of using these products.

This might be achievable through human capital development programmes, farmer organisations or local associations. This paper contends that hands-on training and demonstrations enable farmers to overcome hesitance stemming from a lack of familiarity. Current strategies point to the need to make technology simple and easy to use to minimise the chances of farmers being unable to adopt it on the farm.

Government and Private Sector Collaboration

Although major funding is currently being attracted to agritech start-ups via governemnt grants, the long-term model will require the involvement of both public and private entities.

This implies a need for policies that encourage agritech growth while avoiding excessive dependence on state subsidies. This includes strengthening policy content, creating private-sector incentives, and guaranteeing support for farmers transitioning to better technologies. Scaling efforts via public–private partnerships may help deliver appropriate support to farmers.

Final Thoughts

The Indian agritech industry is at a turning point. Although there is hope in the power of technology to transform agriculture, challenges such as cost, accessibility and uptake remain significant. High-end technologies like IoT sensors and UAVs are often too expensive for small and marginal farmers.

 However, affordable and scalable solutions — such as satellite remote sensing, regionalised products, optional pricing structures and farmers’ sensitisation —are available.   When combined with agricultural expertise and AI/ML, satellite remote sensing emerges as a practical and inclusive solution, making advanced technology accessible even to small and marginal farmers.

 India, being one of the top agricultural producers globally, has a wealth of insights from its diverse farming landscape. These learnings not only improve Indian agriculture but are also leveraged globally to assist small and marginal farmers elsewhere.


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Monday, April 21, 2025

How engineering innovations are driving a sustainable future

 

How engineering innovations are driving a sustainable future

India’s rapid growth in renewable energy, sustainable manufacturing, and smart infrastructure is positioning the nation as a global leader in clean and resilient development.



India has made notable strides in the renewable energy sector in the last decade. According to a report by the Ministry of New and Renewable Energy, the installed capacity under the Renewable Energy (RE) sector, including large hydro, rose from 81.22 GW in 2014-15 to 190.57 GW by 2023-24, marking a remarkable growth of 134.63% during this period.

Furthermore, the report highlights a significant global shift towards clean energy. As of December 31, 2023, the overall installed capacity under the RE and non-RE sectors globally stood at 8987.26 GW, with 3864.52 GW installed under the RE sector.

In addition to renewable energy, eco-friendly manufacturing processes are also gaining momentum in India. One of the critical challenges in urban areas is the treatment of wastewater.

In this regard, The Energy and Resources Institute (TERI's) Advanced Oxidation Technology (TADOX) is effectively treating textile and dyeing wastewater, accomplishing zero liquid discharge and enhancing water reuse. Such technologies are key in addressing the environmental challenges posed by industrial activities and promoting sustainable manufacturing practices.

Additionally, according to TERI, nearly 66% of the sewage generated in cities remains untreated, leading to environmental pollution and contamination of freshwater sources.
The high infrastructure expense of centralised treatment systems is a considerable barrier to effective wastewater management. 

To address this issue, innovative solutions have been developed, such as ceramic membranes from waste fly-ash for use in Membrane Bioreactors (MBRs). These solutions provide high-quality treated water at an affordable cost.

Moreover, smart infrastructure is redefining daily activities with the integration of cutting-edge technologies such as the Internet of Things (IoT), Artificial Intelligence (AI), and advanced data analytics. Together, these innovations are remarkably enhancing the quality of urban life, making cities smarter and more responsive to the needs of their residents.

These technological advancements are just the tip of the iceberg of what the world is witnessing. They are not only transforming industries but also paving the way for a greener and more resilient future.

The role of educational institutions

A strong foundation in technical education is essential for driving this transformation. Leading technology education institutions in India, like Birla Institute of Technology (BIT) Mesra are taking the lead in fostering innovation and research in renewable energy, smart infrastructure, and environment-friendly manufacturing. 

By empowering students with contemporary skills and knowledge, these institutions are preparing the next generation of engineers and scientists to address the sustainability challenges of the future. Moreover, strategic alliances between academia, industry, and government are essential for materialising research into viable solutions.

Collaborative projects with local industries and communities promote a culture of innovation, encouraging students to design solutions that address real environmental issues.
This proactive approach not only enhances students' employability but also contributes to the broader goal of sustainable development, as fresh ideas and creative solutions emerge from young minds. 

Furthermore, this will create a conducive ecosystem for scaling up successful innovations to achieve environmental and economic advantages.

India’s advancements in renewable energy, smart infrastructure, and eco-friendly manufacturing are setting a benchmark for other nations to follow. With its robust technological framework and commitment to sustainable development, the country is well-positioned to emerge as a leader in the global sustainability landscape. 


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Saturday, April 19, 2025

UPI remains GST-free: Centre clarifies no tax on digital payments

 

UPI remains GST-free: Centre clarifies no tax on digital payments

The CBIC stated that the Government planning to impose GST on UPI transactions exceeding Rs 2,000 are entirely unfounded and inaccurate. At present, there is no official proposal in this regard.

UPI remains GST-free: Centre clarifies no tax on digital paymentsDigital transactions through UPI touched a record high of Rs 24.77 lakh crore in March 2025.

Amid circulating claims on social media, the Centre has firmly denied reports that it is planning to impose GST on UPI transactions over Rs 2,000. The Ministry has clarified that such claims are completely false, misleading, and baseless.

There is currently a lot of discussion surrounding the imposition of GST on UPI transactions exceeding Rs 2,000. This news has captured the attention of various UPI user groups, including individual users and small business owners, causing significant speculation within the community. 

Following the buzz on social media, the Central Board of Indirect Taxes & Customs took to the social media platform X explaining the government's stand on charging GST on digital payments. It said UPI has revolutionised the way people in rural communities can make payments and receive funds, eliminating the need for physical cash.

"The claims that the Government is considering levying GST on UPI transactions over ₹2,000 are completely false, misleading, and without any basis. Currently, there is no such proposal before the government. GST is levied on charges, such as the Merchant Discount Rate (MDR), relating to payments made using certain instruments. Effective January 2020, the CBDT has removed the MDR on Person-to-Merchant (P2M) UPI transactions through the Gazette Notification dated 30th December 2019. Since currently no MDR is charged on UPI transactions, there is consequently no GST applicable to these transactions," the post read.

Here’s what you need to know:

No GST on UPI: There is no proposal under consideration to levy GST on UPI payments.

No MDR = No GST: Since Merchant Discount Rate (MDR) was removed for Person-to-Merchant (P2M) UPI payments in January 2020, GST is not applicable on such transactions.

The CBDT notification dated 30th December 2019 officially abolished MDR for P2M UPI payments.

Government Is Promoting, Not Taxing UPI

Contrary to the false claims, the government has been actively incentivising digital payments, especially low-value UPI transactions. To support this, a UPI Incentive Scheme has been in place since FY 2021-22:FY 2021-22: Rs 1,389 crore

FY 2022-23: Rs 2,210 crore

FY 2023-24: Rs 3,631 crore

These payouts help cover transaction costs for merchants, encouraging wider adoption and innovation in digital payments.

UPI in India

India's UPI has emerged as a global leader in real-time digital payments, setting new benchmarks in scale, adoption, and impact.

According to data from the National Payments Corporation of India (NPCI), transactions through UPI reached a new peak in March, totaling Rs 24.77 lakh crore. This marks a 12.7% increase from the previous month's total of Rs 21.96 lakh crore. The NPCI also reported that the value of UPI transactions in March 2025 was significantly higher than in the same month last year, with a total of Rs 24.77 lakh crore compared to Rs 19.78 lakh crore. In addition, UPI transactions in March 2025 saw a 25% increase in value and a 36% growth in volume compared to the previous year.

According to the ACI Worldwide Report 2024, India accounted for a staggering 49% of all global real-time transactions in 2023, far surpassing other nations and solidifying its position as the world’s most advanced real-time payments ecosystem.

The growth in transaction value is equally impressive. UPI payments surged from Rs 21.3 lakh crore in FY 2019-20 to Rs 260.56 lakh crore by FY 2024-25, highlighting its rapid integration into daily life. Notably, Person-to-Merchant (P2M) payments reached Rs 59.3 lakh crore, indicating increasing acceptance by small businesses and retailers, as well as rising consumer trust in cashless payments.



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Thursday, April 17, 2025

Could CT scans be fuelling a future rise in cancer cases, as a new study suggests?

Could CT scans be fuelling a future rise in cancer cases, as a new study suggests?


CT scans are a vital part of modern medicine. Found in every hospital and many clinics, they give doctors a fast and detailed look inside the body – helping to diagnose everything from cancer and strokes to internal injuries. But a new study suggests there may be a hidden cost to our growing reliance on this technology.

The study, published in Jama Internal Medicine, warns that CT scans performed in the US in 2023 alone could eventually lead to over 100,000 extra cancer cases. If the current rate of scanning continues, the researchers say CT scans could be responsible for around 5% of all new cancers diagnosed each year.

That figure has raised concerns. Especially when you consider that the number of CT scans done in the US has jumped by 30% in just over a decade. In 2023, there were an estimated 93 million CT exams carried out on 62 million people.

The risk from a single scan is low – but not zero. And the younger the patient, the greater the risk. Children and teenagers are especially vulnerable because their bodies are still developing, and any damage caused by ionising radiation may not show up until many years later.

That said, over 90% of CT scans are performed on adults, so it’s this group that faces the largest overall impact. The most common cancers linked to CT exposure are lung, colon, bladder and leukaemia. For women, breast cancer is also a significant concern.

A person receiving chemotherapy. Only their arm is visible.
CT scans are associated with lung, colon, bladder, leukaemia, breast and other cancers. Canon2260 / Alamy Stock Photo

What makes this latest estimate so striking is how much it has grown. In 2009, a similar analysis projected around 29,000 future cancers linked to CT scans. The new number is over three times higher – not just because of more scans, but because newer research allows for a more detailed analysis of radiation exposure to specific organs.

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The study also makes an eye-catching comparison: if things stay as they are, CT-related cancers could match the number of cancers caused by alcohol or excess weight – two well-known risk factors.

Not all scans carry the same level of risk. In adults, scans of the abdomen and pelvis are thought to contribute the most to future cancer cases. In children, it’s head CTs that pose the biggest concern – especially for babies under the age of one.


Often life-saving

Despite all this, doctors stress that CT scans are often life-saving and remain essential in many cases. They help catch conditions early, guide treatment and are crucial in emergencies. The challenge is making sure they’re only used when really needed.

Newer technologies could help reduce the risk. Photon-counting CT scanners, for example, deliver lower doses of radiation, and MRI scans don’t use radiation at all. The researchers suggest that better use of diagnostic checklists could also help doctors decide when a scan is necessary, and when a safer alternative like MRI or ultrasound might do the job.

It’s worth noting that this study doesn’t prove CT scans cause cancer in individual people. The estimates are based on “risk models” – not direct evidence. In fact, the American College of Radiology points out that no study has yet linked CT scans directly to cancer in humans, even after multiple scans.

Still, the idea that radiation can cause cancer isn’t new. It’s scientifically sound. And with the huge number of scans being done, even small risks can add up.

CT scans save lives, but they’re not risk-free. As medical technology evolves, so too should the way we use it. By cutting down on unnecessary scans, using safer alternatives where possible, and keeping radiation doses as low as practical, we can ensure CT scans continue to help more than they harm.

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