Earth
When the Floods Cleared the Skies, and Firecrackers Choked Them Again
Delhi’s air improved after floods cut stubble burning by 77%, but Diwali’s fireworks pushed PM2.5 to record highs — exposing India’s pollution paradox
Delhi’s toxic air returned this October in a troubling sequence of contrasts. For two weeks, the Indian capital breathed marginally cleaner air — not because of new policies or enforcement, but because nature intervened. Massive floods in Punjab and Haryana dramatically reduced stubble burning, cutting agricultural fires by more than 77%. But just as the air began to clear, the Diwali festival sent pollution levels soaring to their highest in five years.
Fresh analyses of satellite fire counts and ground-level pollution data reveal the fragile nature of Delhi’s air quality gains — and how quickly they can unravel when local emissions spike.
A Flood-Induced Experiment in Clean Air
From October 1–12, 2025, combined stubble-burning incidents in Punjab and Haryana dropped from 779 to just 175, according to new analysis by Climate Trends, a research-based consulting firm. The widespread monsoon flooding that year left farmlands waterlogged, delaying harvest cycles and making crop residue burning nearly impossible.
The results were immediate. Delhi’s average PM2.5 concentration fell by 15.5% compared to the same period in 2024 — from 60.79 µg/m³ to 51.48 µg/m³. The link between upwind agricultural fires and air quality in the National Capital Region became unmistakably clear.
“The floods served as an unplanned intervention, drastically lowering fire activity and proving how strongly stubble burning impacts Delhi’s air quality,” the report observed. In 2024, when fire activity was high, the day with the most burning (October 12) also recorded Delhi’s worst pollution. In 2025, as those fires disappeared, the capital’s skies briefly showed signs of recovery.
But experts caution that the improvement was relative, not absolute. Even with crop fires nearly wiped out, Delhi’s average PM2.5 remained above 50 µg/m³ — far exceeding the World Health Organization’s safe limit of 5 µg/m³. “This reveals a significant background load from vehicles, industries, and dust,” the analysis noted.
Then Came Diwali — and the Air Turned Grey Again
Just weeks later, the city’s respite vanished.
Data from the Central Pollution Control Board show PM2.5 levels leaping from 156.6 µg/m³ before Diwali to 488 µg/m³ after the festival — a threefold jump that made this year’s Diwali the most polluted in recent memory. The highest hourly concentrations, touching 675 µg/m³, were recorded late into the night of the celebrations.
“This year’s Diwali has proven to be even worse than before,” said Palak Balyan, Research Lead at Climate Trends, in a statement. “The data clearly show a sharp rise in pollution levels, with post-Diwali PM readings averaging around 488 compared to just 156.6 before the festival. Green crackers made no measurable difference compared to regular ones.”
Meteorological conditions compounded the damage. Calm winds, below 1 metre per second, and a nighttime temperature inversion trapped pollutants close to the surface. “It is most likely that the high concentration of PM2.5 is due to local emission of firecrackers,” explained Dr. S.K. Dhaka, Professor at Rajdhani College, University of Delhi. “The pollution is of local nature, not transported from other places.”
The Limits of Seasonal Fixes
The back-to-back contrasts of October 2025 expose the complexity of Delhi’s air pollution crisis — a cycle that oscillates between rural and urban sources, and between policy action and cultural inertia.
“The floods achieved what enforcement often struggles to do — a 77.5% drop in stubble burning,” noted the analysis. Yet, within weeks, those gains were erased by festival emissions and weak regulation.
For environmentalists, it was a reminder that neither short-term bans nor weather anomalies can substitute for long-term emission control. “It’s disheartening that even after years of witnessing the harmful effects of burning firecrackers, we continue to repeat the same mistake,” said Aarti Khosla, Founder and Director of Climate Trends. “This pollution severely impacts children, pregnant women, the elderly, and those who are unwell. I sincerely urge everyone to be more mindful and sensitive towards our environment.”
A Global Mirror
Delhi’s story resonates far beyond India. Across Asia, seasonal pollution spikes linked to agriculture and festivals remain entrenched. From rice stubble burning in Thailand and Vietnam to haze from forest fires in Indonesia, similar emissions patterns are repeatedly visible — and so are the lessons.
Temporary improvements, whether due to floods or lockdowns, underscore what is possible when emissions fall drastically. Yet, the persistence of “base pollution” from transport, industry, and energy use continues to keep air quality at unsafe levels year-round.
In that sense, 2025 offered a real-world experiment: when emissions from one sector (agriculture) dropped sharply, air quality improved almost immediately. But when another (fireworks and vehicles) spiked, the benefits evaporated just as fast.
Experts argue that India’s clean air strategy must move beyond reactive bans and seasonal blame games. The 2025 data underline the need for coordinated, year-round emission control — from crop management in rural states to mobility and energy transitions in cities.
Earth
Vantara: Inside a Billionaire-Backed Bid to Build a Global Wildlife University
The launch comes at a time when conservation challenges are becoming increasingly complex.
A new private university focused on wildlife conservation and veterinary sciences is being positioned as an ambitious attempt to reshape how the world trains the next generation of conservation professionals—backed by one of Asia’s most influential business families.
The institution, Vantara University, has been launched in western India by a wildlife initiative founded by Anant Ambani, part of the Reliance group. Framed as an integrated academic ecosystem, the project reflects a growing trend where private capital is stepping into areas traditionally led by public institutions and global nonprofits.
Vantara officially describes the university as the “world’s first integrated global university” dedicated to wildlife conservation and veterinary sciences. While the scale and integration may be distinctive, similar disciplines are already taught across universities worldwide, often through specialised schools, research centres, and veterinary colleges.
The claim, therefore, rests less on the existence of such education and more on the attempt to consolidate it within a single, purpose-built institutional framework.
A Shift Toward Education-Led Conservation
The launch comes at a time when conservation challenges are becoming increasingly complex. Climate change, habitat fragmentation, and the spread of zoonotic diseases are reshaping ecosystems and exposing the limits of traditional conservation models.
There is a growing recognition that protecting biodiversity will require not just field interventions, but a systemic expansion of expertise—from wildlife veterinarians and epidemiologists to policy specialists and conservation planners.
Vantara University aims to respond to this gap by bringing together disciplines such as wildlife medicine, genetics, behavioural sciences, epidemiology, and conservation policy under one academic structure.
Blending Science, Scale, and Philosophy
The university’s vision combines scientific training with a philosophical framing rooted in compassion and stewardship. Its design draws inspiration from historical centres of learning, while positioning itself as a modern, purpose-led institution.
“The future of conservation will depend on how we prepare minds and institutions to serve life with compassion, knowledge, and skill,” Anant Ambani said in a statement.
“Vantara University is shaped by a deeply personal journey of witnessing animals in distress and recognising the need for greater capability in their care… the university seeks to nurture a new generation committed to protecting every life.”
Global Ambitions, Local Foundations
Although based in India, the project is clearly aimed at a global audience.
The university plans to offer undergraduate, postgraduate, and specialised programmes, supported by research infrastructure and international collaborations. It also emphasises action-oriented learning, linking academic work with real-world conservation practices.
This approach reflects a broader shift in higher education, where institutions are increasingly expected to produce not just knowledge, but deployable expertise.
The Rise of Private Influence in Conservation
The initiative also highlights a larger structural shift: the growing role of private capital in shaping conservation agendas.
Historically, conservation has been driven by governments, multilateral agencies, and non-profit organisations. However, large-scale funding gaps and the urgency of environmental crises are opening the door for philanthropic and corporate actors to play a more prominent role.
This raises both opportunities and questions.
Private initiatives can accelerate innovation and investment, but they also bring concerns around governance, accountability, and long-term alignment with public interest.
Questions of Access and Impact
As with many specialised institutions, accessibility will be a critical test.
While the university has announced scholarships aimed at supporting students from diverse backgrounds, the broader question remains: can such models scale inclusively, particularly for communities most directly affected by environmental change?
The effectiveness of the initiative will also depend on its ability to influence policy, contribute to global research, and produce professionals equipped to address complex ecological challenges.
A Changing Conservation Landscape
The launch of Vantara University signals a deeper transition in how conservation is being imagined.
Increasingly, the field is moving beyond isolated interventions toward integrated systems that connect science, education, and practice. In this context, universities are not just centres of learning—they are becoming critical infrastructure in the fight to preserve biodiversity.
Whether this particular model succeeds will depend on execution, collaboration, and its ability to move beyond vision into measurable impact.
But its emergence underscores a central reality:
The future of conservation may depend as much on classrooms and laboratories as it does on forests and protected areas.
Earth
Study Reveals How Ocean Bacteria Drive Plastic Biodegradation
Plastic biodegradation is emerging as a critical solution to the global waste crisis, and new research from Massachusetts Institute of Technology offers important insights into how this process actually works in nature.
A new study by researchers at Massachusetts Institute of Technology has shed fresh light on how bacteria in marine environments collaborate to break down biodegradable plastics—offering critical insights into tackling the global plastic waste crisis.
Biodegradable plastics have long been seen as a potential solution to mounting environmental pollution. However, scientists have struggled to determine how long these materials persist in real-world conditions and how microbial communities contribute to their breakdown.
The study, published in Environmental Science and Technology, marks one of the first efforts to identify the specific roles individual bacterial species play in plastic biodegradation.
“Plastic biodegradation is highly dependent on the microbial community where the plastic ends up,” says lead author Marc Foster, a PhD researcher in the MIT-WHOI Joint Program. “It’s also dependent on the chemistry of the plastic itself.”
Unlike earlier studies that focused on single microbes, the MIT team examined how multiple bacterial species work together—a more realistic representation of how plastics degrade in nature.
The researchers studied a widely used biodegradable plastic known as an aromatic aliphatic co-polyester, commonly found in shopping bags, food packaging, and agricultural films.
Samples of this plastic were first exposed to seawater in the Mediterranean, allowing natural bacterial communities to form biofilms on their surface. Scientists then isolated and analysed these microbes in the lab.
Key findings include:
- One bacterium, Pseudomonas pachastrellae, was able to break down the plastic polymer into smaller chemical components.
- Other bacterial species were needed to consume those individual chemicals, including terephthalic acid, sebacic acid, and butanediol.
- No single bacterium could complete the entire degradation process alone.
When researchers combined five complementary bacterial species, they were able to replicate the full degradation process observed in a larger microbial community.
“This complementary function was essential,” Foster explains. “None of the bacteria alone could achieve the same level of degradation as when they worked together.”
Why Plastic Biodegradation Rates Vary
The findings suggest that the speed and efficiency of plastic biodegradation depend on several key factors:
- Microbial diversity in the environment
- Chemical composition of the plastic
- Environmental conditions such as temperature and depth
Notably, the study also found that the same bacterial community could not degrade a different type of plastic, indicating that microbial systems may be highly material-specific.
Implications for Future Plastic Recycling Solutions
The research represents an important step toward developing microbial recycling systems that could convert plastic waste into useful materials.

By understanding how bacteria interact with plastics at a molecular level, scientists could:
- Design plastics that degrade more predictably
- Engineer microbial communities for faster plastic breakdown
- Develop biological recycling technologies
Foster notes that future work will explore how to optimise bacterial combinations and improve enzyme interactions with plastic surfaces.
A Step Forward in Tackling the Plastic Waste Crisis
With more than half of global plastic waste ending up in landfills or the environment, understanding plastic biodegradation is crucial for sustainable material design.
This study highlights a fundamental shift in perspective: plastic degradation is not driven by a single organism, but by complex microbial collaboration.
As research advances, such insights could help bridge the gap between biodegradable materials and real-world environmental outcomes—bringing science closer to solving one of the planet’s most pressing pollution challenges.The study, published in Environmental Science and Technology, marks one of the first efforts to identify the specific roles individual bacterial species play in plastic biodegradation.
“Plastic biodegradation is highly dependent on the microbial community where the plastic ends up,” says lead author Marc Foster, a PhD researcher in the MIT-WHOI Joint Program. “It’s also dependent on the chemistry of the plastic itself.”
Unlike earlier studies that focused on single microbes, the MIT team examined how multiple bacterial species work together—a more realistic representation of how plastics degrade in nature.
Earth
EP Investigation: Hidden Epidemic, Tuberculosis Spreads Among Kerala’s Captive Elephants
An EP Investigation into tuberculosis in Kerala’s captive elephants reveals human transmission risks, weak screening systems, and urgent policy gaps.
Tuberculosis in Kerala’s captive elephants has become a silent but persistent threat, driven largely by human-to-animal transmission, chronic stress, and systemic failures in veterinary public health. An EdPublica (EP) Investigation reveals how the absence of routine screening, weak governance, and prolonged neglect could turn a preventable disease into a far larger crisis in the years ahead.
By Lakshmi Narayanan | EP Investigation
Tuberculosis is quietly spreading among Kerala’s captive elephants, sustained not by wildlife exposure but by human contact, chronic stress, and systemic neglect. Long treated as a marginal veterinary issue, the disease represents a serious and largely ignored public health and animal welfare crisis—one that experts warn could intensify in the coming years if left unaddressed.
Kerala hosts one of the largest populations of captive Asian elephants in India, housed by temples, private owners, and festival organisers. According to a Forest Department survey concluded in February 2025, the state currently has 389 captive elephants, marking a steady decline from 521 in 2018 and over 700 in 2010, with the majority now owned by private individuals. This sharp reduction over the past decade reflects broader stresses within the captive elephant system, including ageing animals, declining ownership viability, and chronic health concerns.
Within this shrinking population, tuberculosis is neither new nor rare; it is endemic. Historical veterinary records and animal welfare documentation indicate that in earlier years, TB may have contributed to as many as 25 captive elephant deaths annually. Yet in recent times, detailed and transparent reporting on TB-related infections and fatalities has largely disappeared from public view, creating a misleading impression that the risk has diminished when, in reality, surveillance itself has weakened.
This absence of attention does not signal reduced risk. Tuberculosis is a slow, insidious disease that can remain latent or undiagnosed for years. Without mandatory screening or transparent surveillance, infection can circulate undetected within captive elephant populations—allowing animals to suffer prolonged illness and potentially function as silent reservoirs of infection.

The persistence of tuberculosis among captive elephants is not accidental. It is the result of a convergence of vulnerabilities: constant exposure to infected humans, immune suppression driven by captivity-related stress, and systemic failures in veterinary public health governance. Together, these factors have created ideal conditions for a preventable disease to endure—largely unseen, and largely unchallenged.
The Human–Elephant Interface: A Critical Transmission Pathway
The primary route of TB transmission among Kerala’s captive elephants is reverse zoonosis: the spread of infection from humans to animals. The causative agent, Mycobacterium tuberculosis, is a human-adapted pathogen transmitted through respiratory aerosols. In settings where elephants live and work in close proximity to people, this pathway becomes epidemiologically decisive.
Mahouts and handlers represent the most significant source of chronic exposure. Their daily routines—feeding, bathing, training, and transporting elephants—require prolonged, close physical contact. If a handler carries an active or latent TB infection, the opportunity for transmission to the animal is constant and cumulative.
In addition to handlers, the general public constitutes a secondary but important exposure source. Kerala’s festival culture routinely places elephants amid dense crowds, often for extended periods. These gatherings create intermittent but high-volume opportunities for transmission from undiagnosed or untreated individuals within the broader population. Together, these human reservoirs ensure that captive elephants are rarely insulated from the pathogen. Yet exposure alone does not fully explain disease persistence. The risk of infection is significantly magnified by conditions that undermine the elephants’ immune defenses.
“Tuberculosis in captive elephants is a severe and often underestimated disease. What is seen during post-mortem examinations is extensive, chronic organ damage that reflects prolonged suffering rather than sudden illness. These findings are consistent with long-term exposure to Mycobacterium tuberculosis and delayed detection, Dr. Arun Vishvanathan, a veterinary expert based in Kerala’s Palakkad district, tells EdPublica.
“From a medical and public health perspective, this condition is particularly concerning because it is largely driven by human-to-animal transmission. Elephants living in close, continuous contact with people—especially under stressful captive conditions—experience immune suppression, which allows the infection to progress unchecked. This is not an unavoidable disease; it is a preventable one. Without routine screening of both handlers and elephants, early diagnosis, and strict biosecurity measures, such cases will continue to occur, resulting in needless animal suffering and ongoing public health risk,” Dr. Arun Vishvanathan adds.
Stress, Captivity, and Immune Compromise
Captive environments impose profound physiological and psychological stress on elephants, a species evolved for expansive movement, complex social structures, and environmental autonomy. Confinement to restricted spaces, prolonged chaining, limited exercise, and forced participation in noisy, crowded festivals all contribute to chronic stress.
Scientific evidence across species demonstrates that sustained stress suppresses immune function. In elephants, this immunosuppression reduces resistance to opportunistic infections such as TB and increases the likelihood that latent infections will progress to active disease.
Crowding further compounds the problem. Elephants housed in close quarters or transported frequently between venues are exposed not only to more humans but also to environments conducive to airborne disease transmission. In these conditions, respiratory pathogens can spread efficiently, especially when animals are already physiologically compromised.

”Tuberculosis in Kerala’s captive elephants spreads primarily through close, repeated contact with infected humans, and is sustained by conditions that weaken the animals’ natural defenses. Unlike many wildlife diseases, this is not an infection originating in forests—it is largely a human-driven disease cycle. Mahouts and handlers are the most significant transmission source. Daily activities such as feeding, bathing, chaining, and transport require close physical proximity, often for hours at a time. If a handler has active or undiagnosed TB, the elephant is repeatedly exposed to infectious aerosols,” says Manuprasad, an elephant welfare worker from Thrissur.
Festival crowds and tourists create additional exposure. During temple festivals and public events, elephants are surrounded by dense crowds, sometimes for entire days. In these settings, even brief exposure to multiple infected individuals can result in infection.
Systemic Gaps in Veterinary Public Health
Perhaps the most critical vulnerability lies not in biology but in governance. Kerala lacks a standardized, mandatory TB screening programme for captive elephants. As a result, infected animals—many of them asymptomatic—remain undiagnosed for years. This failure in routine surveillance effectively blinds any meaningful public health response and allows elephants to function as silent reservoirs of infection.
Experts warn that tuberculosis in Kerala’s captive elephants could expand if mandatory screening and biosecurity measures are not urgently implemented.
Nutritional inadequacy is another systemic issue. Economic pressures within the temple and festival ecosystem often translate into suboptimal feeding regimes. Poor nutrition weakens immune responses, lowering the infectious dose required for TB to establish and spread.
Compounding these challenges is a widespread lack of awareness among elephant owners and handlers regarding TB transmission and prevention. Clear, enforceable biosecurity protocols—covering quarantine, treatment, and movement restrictions for TB-positive animals—are largely absent or inconsistently applied. Without such measures, even identified cases pose an ongoing risk to other elephants and to humans.

”As an animal rights and welfare activist, I have personally witnessed the post-mortem of an elephant affected by tuberculosis, and it was deeply distressing. The extent of internal damage revealed the severe and prolonged suffering this animal endured—far beyond what most people realize. Seeing such devastation in an animal of immense strength and dignity is heartbreaking,” explains Ambili Purackal, founder of DAYA, a Kerala-based NGO known for its proactive role in the state’s animal rights movement.
What makes this suffering even harder to accept is that it is largely the result of human exposure. Elephants do not face tuberculosis at these levels in the wild; they contract it through forced, prolonged contact with humans under stressful captive conditions that weaken their immunity. This is not just a veterinary concern but a moral one. These elephants are silent victims of preventable disease, and their suffering is a consequence of human neglect and systemic failure,” Ambili Purackal says.
Secondary and Less-Documented Risks
While human-to-elephant transmission remains the dominant concern, other pathways cannot be entirely dismissed. Interactions with domestic livestock or wildlife in shared environments may contribute to transmission chains, though this remains poorly documented in the Indian context. These ancillary risks further underscore the need for comprehensive epidemiological research.
A Convergence of Vulnerabilities
Taken together, the vulnerabilities facing Kerala’s captive elephants form a self-reinforcing cycle. Constant exposure to a human TB reservoir, chronic immune compromise driven by captivity-related stress and poor nutrition, and systemic failures in disease detection and control create ideal conditions for TB persistence.
Breaking this cycle will require a multi-layered public health approach—one that integrates routine screening, improved nutrition, handler health monitoring, and enforceable management protocols. Without such intervention, tuberculosis will remain a silent epidemic, exacting a slow but devastating toll on one of Kerala’s most culturally significant animal populations.
Silence, in this case, is not neutrality—it is risk.
What Needs to Change
Addressing tuberculosis among Kerala’s captive elephants requires coordinated action across animal welfare, public health, and governance. Experts and welfare workers interviewed by EdPublica point to the following urgent priorities:
1. Mandatory TB Screening
· Routine, standardised tuberculosis testing for all captive elephants
· Regular TB screening for mahouts, handlers, and caretakers
· Immediate isolation and treatment protocols for positive cases
2. Handler Health Monitoring
· Integration of mahout health checks into public TB control programmes
· Confidential diagnosis and treatment access to reduce stigma and underreporting
3. Improved Living Conditions
· Reduced chaining and confinement
· Adequate daily exercise and social interaction
· Limits on festival exposure, crowd density, and noise-related stress
4. Nutritional Standards
· Enforced minimum nutrition guidelines
· Regular veterinary audits to ensure immune-supportive diets
5. Biosecurity and Movement Controls
· Quarantine protocols for newly acquired or transferred elephants
· Restrictions on inter-district or inter-state movement of TB-positive animals
6. Transparent Reporting and Oversight
· Publicly accessible data on TB cases and outcomes
· Independent audits of temple and private elephant management practices
7. Interdepartmental Coordination
· Formal collaboration between forest, animal husbandry, and public health departments
· Recognition of TB in captive elephants as a One Health issue—linking human, animal, and environmental health
Some sources in this investigation have requested anonymity due to professional or personal safety concerns. Their identities are known to EdPublica and their statements have been independently verified.
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