Society
Death toll 280 & counting: what is the science behind Kerala’s deadly landslides?
Haunting images reveal uprooted trees, homes reduced to rubble, and bridges shattered, all swallowed by muddied waters. Each scene tells a story of loss, despair, and the enduring resilience of those affected
The landslides in Wayanad, a tourist-friendly district in the southern Indian state of Kerala, are rapidly becoming one of the most devastating natural disasters the region has ever seen. Entire areas in Chooralmala and Mundakai villages have been washed away, with local media reporting the destruction of over 250 homes. Tragically, the death toll has surpassed 280, marking a grim chapter in the region’s history.
The disaster, the worst since the devastating floods of 2018, has left a heart-breaking trail of destruction. Haunting images reveal uprooted trees, homes reduced to rubble, and bridges shattered, all swallowed by muddied waters. Each scene tells a story of loss, despair, and the enduring resilience of those affected.
Nestled in the rugged terrain of the Western Ghats, Wayanad is renowned for its stunning vistas and is a cherished tourist destination, attracting over 100,000 visitors each year. This picturesque district, home to indigenous tribes and dotted with lush tea and cardamom estates, holds a unique charm. Yet, beneath its beauty lies a history of vulnerability to landslides.
A 2011 report by a panel of experts led by ecologist Madhav Gadgil classified the entire Wayanad region as “fragile, medium fragile, and less fragile,” highlighting its susceptibility to landslides
A 2011 report by a panel of experts led by ecologist Madhav Gadgil classified the entire Wayanad region as “fragile, medium fragile, and less fragile,” highlighting its susceptibility to landslides. This designation underscores the delicate balance of this ecologically sensitive area, where the enchanting landscape masks the underlying risks faced by its resilient inhabitants.

In the past decade alone, landslides have claimed the lives of 255 people in Kerala. In 2018, 109 people died in landslides, and in 2020 and 2021, around 182 lives were lost to these disasters. August 2020 saw a particularly deadly landslide in Pettimudi, which resulted in 66 fatalities.
Understanding Landslides
Landslides, also known as landslips, encompass a dramatic and diverse array of ground movements that can reshape landscapes in an instant. These natural events, ranging from rockfalls and mudflows to slope failures and debris flows, occur across various environments. Whether cascading down steep mountain ranges, eroding coastal cliffs, or shifting underwater as submarine landslides, these movements highlight the dynamic and unpredictable nature of the terrain. As communities and scientists grapple with their impacts, the stories behind these powerful geological forces continue to unfold.
While gravity is the main force behind landslides, various factors influence slope stability, creating conditions that make a slope vulnerable to failure. Often, a specific event like heavy rainfall, an earthquake, or construction activity triggers a landslide, though the precise cause isn’t always identifiable.
Human activities often exacerbate landslides. Urban sprawl, mining, and deforestation contribute to land degradation, reducing soil stabilization by vegetation. Additionally, global warming and other environmental impacts increase the frequency of extreme weather events, further triggering landslides.
The Catastrophe in Wayanad
Mundakai, the epicentre of a series of landslides, received 572 mm of rain in 48 hours. According to the India Meteorological Department, rainfall exceeding 204.4 mm per day is considered extremely heavy. Experts attribute the landslide in the Mundakai region to this heavy rainfall. In 2019, the Puthumala landslide occurred just two to three kilometres from the current disaster site.
Dr. S. Abhilash from the Cochin University of Science and Technology highlighted the region’s geographical vulnerability. He stated in a video shared on the university’s official Facebook page that heavy nighttime rain was the primary cause of the landslide.
The phenomenon, technically known as a mesoscale mini cloudburst, involves 15 to 20 cm of rain falling within two to three hours. Such events are now occurring in North Kerala, significantly impacting the region
In the past two weeks, the Konkan region (a stretch of land by the western coast of India) experienced heavy rainfall due to a low-pressure area from the Gujarat coast to North Kerala. North Kerala received 50 to 70 percent more rain than usual during this period, with areas including Wayanad recording over 24 cm of rain. The thickening of clouds in the southeast Arabian region contributed to this heavy rainfall.
This phenomenon, technically known as a mesoscale mini cloudburst, involves 15 to 20 cm of rain falling within two to three hours. Such events are now occurring in North Kerala, significantly impacting the region.
Mesoscale Cloudbursts and Kerala Floods
An earlier study published in Science Direct linked mesoscale cloudbursts to the 2019 Kerala floods. Researchers at the Advanced Centre for Atmospheric Radar Research (ACARR), Cochin University of Science and Technology (CUSAT), observed that rainfall exceeding 50 mm in two hours was reported in many places from 8 a.m. to 10 p.m. on August 8, 2019.
The Western Ghats, which run through Kerala, are prone to frequent landslides during the biannual monsoon seasons. The Gadgil Committee report classified areas like Kavalappara in Malappuram district and Puthumala in Wayanad district, which experienced fatal landslides in 2020, as Ecologically Fragile Land (EFL). Climate change exacerbates these issues.
Kerala has faced significant challenges due to climate change in recent years. The state endured a severe drought in 2015, followed by the devastating Ockhi cyclone in 2017. In 2018 and 2019, massive floods and landslides wreaked havoc.
The extreme rainfall of August 2019, which caused landslides and mudslides, leading to downstream flooding, was a ‘mesoscale cloudburst’—a rare phenomenon in Kerala usually seen in North India, according to the study published in ScienceDirect.
Given the increasing intensity of rainfall, the probability of landslides in the Western Ghats’ high to mid-land slopes during the monsoon seasons rises. Human intervention, primarily for crop cultivation, has altered the Western Ghats, making the region more prone to landslides of various scales.
Society
Hormuz Crisis Exposes Global Fertiliser Dependency Risks
Hormuz disruption highlights risks of fertiliser dependency as experts warn of food security threats and call for agroecology shift.
Fertiliser dependency has come under sharp global scrutiny as tensions around the Strait of Hormuz highlight how geopolitical disruptions can ripple through food systems, raising concerns over food security and farm resilience.
The Strait of Hormuz, a critical chokepoint for global energy supplies, plays a central role in fertiliser production due to its link to fossil fuel exports. Any disruption threatens to push up fertiliser costs—directly impacting agricultural production worldwide, according to an analysis by Zero Carbon Analytics (ZCA).
How Fertiliser Dependency Shapes Global Food Systems
Experts warn that modern agriculture’s heavy reliance on fossil fuel-based fertilisers has created a fragile system vulnerable to geopolitical shocks.
“This vulnerability is a choice, and one that we all pay for,” says Raj Patel, economist and food systems expert at the University of Texas. “Nearly 90 percent of the $540 billion in annual agricultural support goes to the same chemical-intensive production that depends on them. We didn’t stumble into this dependency. We funded it.”
The reliance is deeply embedded in global subsidies and production models, making rapid transitions difficult but increasingly necessary.
Farmers Face Rising Costs Amid Hormuz Tensions
Farmers across Asia are already feeling the pressure of rising fertiliser prices as geopolitical tensions escalate.
“With fertiliser prices rising—and the planting season soon to begin—Asia’s farmers are once again being forced to choose between rising costs and falling yields,” says Shamika Mone, President of the Inter-Continental Network of Organic Farmer Organisations.
She adds that consumers are also likely to face further food price hikes, underlining the broader socio-economic impact.
A Fragile System Under Stress
The current crisis is being described as more than just a supply issue—it is a structural problem in global agriculture.
“What we are seeing is not just a fertiliser and commodity crisis, it is a stress test to a fragile food system that is not designed to be resilient,” says Belén Citoler of the World Rural Forum.
The disruption has exposed how interconnected energy markets and food systems have become, with shocks in one quickly cascading into the other.
Agroecology and Organic Farming as Alternatives
Across continents, experts and farmers are calling for a shift toward more resilient agricultural practices that reduce fertiliser dependency.
“The conflict in Iran highlights the vulnerability of an agriculture system that is overly reliant on fossil fuel fertilisers,” says Oliver Oliveros of the Agroecology Coalition.
He points to growing efforts by countries such as Brazil, Kenya, and Vietnam to support agroecological practices that use natural fertilisers and nitrogen-fixing plants.
Farmers themselves are also adapting.
“Geopolitical conflicts… show how vulnerable our agricultural system has become,” says German farmer Olivier Jung, who has been experimenting with crop diversity and reduced external inputs to build resilience.
Similarly, Brazilian farmer Thales Bevilacqua Mendonça warns that global supply chains are increasingly unstable, urging a shift toward ecological farming practices.
Policy Shift Seen as Key to Reducing Fertiliser Dependency
Experts argue that reducing fertiliser dependency will require systemic policy changes, particularly in how agricultural subsidies are allocated.
“To speed up the transition, we need to redirect billions in agriculture subsidies… and invest in approaches that safeguard farmers and consumers from energy price volatility and climate shocks,” Oliveros adds.
Organic farming advocates also stress that proven alternatives already exist.
“If we really want to take food security seriously, policymakers must support the most resilient models… organic farming must become a pillar,” says French farmer Olivier Chaloche.
A Turning Point for Global Food Security?
The Strait of Hormuz disruption may prove to be a wake-up call for governments worldwide.
As fertiliser dependency becomes increasingly tied to geopolitical instability, the push toward agroecology, organic farming, and resilient food systems is gaining urgency.
The question now is whether policymakers will act fast enough to transform a system many experts say is no longer sustainable.
Society
South Asia’s $107 Billion LNG Expansion Faces Risk Amid Middle East War: Report
A new report warns South Asia’s LNG infrastructure expansion could face economic and energy risks as Middle East tensions disrupt global gas markets.
South Asia’s ambitious expansion of liquefied natural gas (LNG) infrastructure could expose the region to significant economic and energy security risks as geopolitical tensions disrupt global energy markets, according to a new report by Global Energy Monitor.
The report warns that escalating conflict in the Middle East, particularly attacks on Iran and disruptions to shipping routes in the Strait of Hormuz, could sharply affect LNG prices and supply chains, putting pressure on energy-importing economies such as India, Bangladesh, and Pakistan.
Data from the Asia Gas Tracker, compiled by Global Energy Monitor, shows that the three South Asian countries have about $107 billion worth of LNG terminals and gas pipelines either announced or currently under construction.
Together, these projects represent a major share of global gas infrastructure expansion. Southern Asia accounts for 17% of global LNG import capacity under development—about 110.7 million tonnes per year—and 17% of global gas pipelines by length, totalling 34,146 kilometres, according to the report.
India’s expanding gas infrastructure
India is pursuing one of the largest gas infrastructure expansions in the world. The report notes that the country is developing the second-largest LNG terminal expansion globally and the third-largest gas pipeline buildout.
A chart in the report indicates that India ranks among the top countries worldwide for pipeline construction, with nearly three-quarters of its planned gas pipeline network already under construction.
Meanwhile, Bangladesh and Pakistan each have enough LNG import capacity in development to roughly double their existing capacity, highlighting the scale of the region’s dependence on imported gas.
Price volatility and project risks
Despite projections that global LNG supply could increase later in the decade, the report warns that the market remains highly sensitive to geopolitical disruptions. Even relatively balanced markets can experience price spikes if shipping routes or production are affected.
The ongoing conflict in the Middle East demonstrates how quickly a promising growth market can shift into an affordability crisis, potentially delaying or cancelling major infrastructure projects.
“We’ve seen this story before, and South Asian economies that import LNG will struggle with these price shocks. It’s a reminder of the risks of building new gas infrastructure, and that domestic alternatives like renewable power are more affordable and reliable in the long run..” said Robert Rozansky, global LNG analyst for Global Energy Monitor.
History of cancelled LNG projects
The report also highlights a pattern of stalled or cancelled gas infrastructure projects across the region.
Over the past decade, India, Bangladesh, and Pakistan have shelved or cancelled two to three times more LNG import capacity than they have successfully brought online, reflecting the financial and market risks associated with LNG development.
According to the report, India cancelled or shelved 49 million tonnes per annum of LNG capacity, compared with 23 million tonnes that entered operation between 2016 and 2025. Bangladesh and Pakistan show similar trends.
Renewables gaining ground
At the same time, renewable energy is increasingly competing with natural gas in the region’s power sectors.
Solar generation in Pakistan has more than tripled over the past three years, while India is projected to meet over 40% of its electricity demand with renewable energy by 2030.
The report also notes that improvements in energy storage technologies are enhancing grid flexibility, potentially reducing the role of gas as a backup power source.
Emerging alternatives such as green hydrogen could also help reduce reliance on imported fossil fuels for industrial use in the future.
The Asia Gas Tracker, developed by Global Energy Monitor, is an online database that maps and categorises gas infrastructure across the continent, including pipelines, LNG terminals, gas-fired power plants, and gas fields. The tracker is updated annually and documents projects through detailed data pages.
Climate
Weather, Not Just Emissions, Driving PM2.5 Pollution in Indian Cities: Study
A new Climate Trends report finds weather conditions can alter PM2.5 levels in Indian cities by up to 40%, calling for season-specific reforms in India’s National Clean Air Programme (NCAP).
A new analysis of India’s urban air quality has revealed that weather conditions can significantly influence pollution levels, sometimes masking the real health burden faced by residents. The report, released by Climate Trends, argues that India’s clean air policies must account for seasonal and meteorological factors to effectively tackle particulate pollution across major cities.
The study analysed Central Pollution Control Board (CPCB) monitoring data from 2024–2025 across six major cities — Delhi, Patna, Kolkata, Mumbai, Chennai, and Bengaluru — and found that meteorological conditions alone can shift pollution levels by up to 40 percent even without changes in emissions.
Researchers say the findings highlight a major gap in India’s National Clean Air Programme (NCAP) and recommend that the upcoming Phase-III reforms include season-specific targets, weather-adjusted evaluation metrics, and dynamic action plans triggered by atmospheric conditions.
Delhi’s extreme winter pollution
The report highlights Delhi as continuing to experience the most severe pollution crisis in the country. The capital recorded the highest annual average PM2.5 levels among the cities analysed and experienced prolonged periods of “Severe” and “Emergency” air quality days.
A particularly alarming finding is that Delhi recorded zero clean air days during winter, despite apparent annual improvements in pollution metrics.
According to the researchers, this discrepancy arises because annual averages can hide seasonal pollution spikes that occur during unfavourable weather conditions such as low wind speeds and high humidity.
“This study shows that a 20–30% reduction in annual PM2.5 does not translate into winter air-quality compliance in stagnation-prone cities like Delhi and Patna, where over 70% of days fall under low-wind, high-humidity meteorological regimes. NCAP Phase-III must therefore adopt season-specific targets, meteorology-triggered interventions, and airshed-level management frameworks to achieve meaningful public-health gains,” Aarti Khosla, Founder and Director of Climate Trends, said in a statement.
Weather plays a decisive role
The report emphasises that air pollution is not simply an “emissions-only” problem. Instead, it is strongly shaped by how emissions interact with atmospheric conditions.
Periods of atmospheric stagnation — characterised by low wind speeds and high humidity — prevent pollutants from dispersing, allowing them to accumulate near the ground and intensify exposure levels for urban populations.
Sagnik Dey, Head of the Centre for Atmospheric Sciences at IIT Delhi, explained the scientific basis for this pattern.
“The persistence of PM2.5 exceedances is strongly associated with sub-1 m/s wind regimes and elevated relative humidity across northern cities, where stagnation episodes sustain disproportionately high exposure levels. Ventilation efficiency emerges as the dominant determinant of inter-city variability. However, current NCAP evaluation frameworks primarily assess observed concentration changes without explicitly accounting for meteorological modulation, potentially leading to distorted interpretations of policy effectiveness. Integrating meteorological regime analytics is therefore essential to ensure a scientifically robust and equitable Phase-III evaluation.”
The study also estimates that simply shifting from stagnant atmospheric conditions to well-ventilated ones could reduce PM2.5 levels by 35–40 percent, demonstrating the powerful role of weather in shaping urban air quality.
Emerging patterns across Indian cities
Beyond Delhi, the report identifies several emerging trends across India’s major urban centres.
Southern cities such as Bengaluru and Chennai, historically considered less polluted, are beginning to show signs of winter-time air quality deterioration, signalling a new vulnerability. Meanwhile, Mumbai and Chennai recorded increases in annual pollution levels in 2025, suggesting that pollution challenges are expanding beyond seasonal spikes into year-round concerns.
Patna continues to face an intensifying crisis, emerging as the second-most polluted city after Delhi, driven in part by persistent atmospheric stagnation across the eastern Indo-Gangetic Plain.
In contrast, Bengaluru stands out for maintaining relatively stable and lower pollution levels, reflecting what researchers describe as “structural air-quality resilience.”
Kolkata’s complex pollution dynamics
Kolkata presents a unique case where meteorology interacts strongly with local pollution sources.
Dr. Abhinandan Ghosh of IISER Kolkata said meteorological conditions play a key role in winter pollution episodes in the city. “As a community of atmospheric scientists, we have long cautioned against a simplistic rat race to replicate Western PM₂.₅ benchmarks, for the Indian subcontinent is endowed with its own meteorological idiosyncrasies, complex topography, and friable alluvial soils that elevate baseline particulate concentrations. The report vindicates this standpoint: in Kolkata, it is not emissions alone but the capricious tyranny of winter boundary-layer dynamics – attenuated mixing heights and enfeebled dispersion – that engenders the most deleterious pollution episodes.”
Professor Abhijit Chatterjee of the Bose Institute pointed to biomass and waste burning as major contributors to winter pollution in the city.
“Amongst several sources, at the current scenario, biomass and waste burning are the major concern in Kolkata especially in winter. The high load of PM2.5 exceeding national standards in winter, primarily due to these two sources which accumulate near the surface because of low dispersion and ventilation coefficients.”
Need for season-specific policies
The study concludes that India’s clean air strategy must move beyond a uniform annual target system and instead adopt seasonally calibrated and meteorology-aware policies.
Experts argue that incorporating weather dynamics into pollution management would help policymakers better assess the effectiveness of interventions and design more realistic mitigation strategies.
Without such reforms, the report warns, improvements in annual averages may continue to mask severe seasonal pollution episodes that pose serious health risks to millions of urban residents.
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