LUCKNOW, June 5 -- Extreme heat is no longer just a weather event in Uttar Pradesh. It is increasingly becoming an environmental consequence of how land, water and natural resources have been managed over decades. Scientists say shrinking forests, depleted groundwater, river degradation, mining and rapid urbanisation have weakened the natural systems that once cooled the landscape, creating what they describe as a growing "heat trap". The phenomenon is most visible in Bundelkhand, where Banda recently emerged as one of the hottest places in the world. Yet experts insist the crisis is not irreversible. The same ecosystems whose decline has intensified the heat - forests, rivers, wetlands and groundwater reserves - could also provide the most effective route out of it. As temperatures soar across the state, scientists are increasingly focusing not only on how Uttar Pradesh got trapped in the heat, but also on how it can cool itself again. This summer, residents of Lucknow and several districts across UP are finding themselves trapped in what experts describe as "open-air heat chambers" - a consequence of the Urban Heat Island (UHI) effect. The starkest example emerged from Banda, which shot into global headlines on April 27 when the mercury touched a blistering 47.6degC, making it the hottest city in the world among 8,212 meteorological stations monitored that day. Barely three weeks later, on May 19, Banda sizzled at an even higher 48.2degC, this time claiming the distinction of being the hottest city in the country. Even Lucknow, despite having a green cover spread across 8.33% of its geographical area and vast urban lungs such as Janeshwar Mishra Park, Lohia Park and Kukrail, has not escaped the heat's wrath. The state government has attempted to strengthen green cover through mass plantation drives. Uttar Pradesh has planted over 200 crore saplings during the past seven years. Experts, however, say the full impact will take time as saplings mature into trees. According to the Forest Survey of India, the state's green cover stands at 9.96%, while the government aims to increase it to 15% by 2030. On May 19, while Banda dominated headlines, Agra and Jhansi recorded scorching highs of 46.5degC, while Prayagraj endured 46.4degC the following day, underscoring the widespread grip of extreme heat across the state. Asked about some UP districts recording high day and night temperatures, forest, environment and climate change minister Arun K Saxena said, "The impact of climate change is not seen in a year or two; it takes 25 to 30 years for its effects to become evident. However, the government is taking steps to counter its impact. The government is aware of the situation and is working on it." Scientists and environmental researchers say the extreme temperatures witnessed in Bundelkhand are not merely the result of global warming or a particularly harsh summer. Prof Venkatesh Dutta of Babasaheb Bhimrao Ambedkar University said, "Banda in Bundelkhand region got hot because several stressors piled up at once. Climate crisis, water scarcity, poverty, and forest loss are all feeding each other. The Bundelkhand region has rocky terrain that intensifies heat, very low humidity, and hot dry Westerlies blowing in. Also anticyclone near the Thar desert pushes hot winds toward Banda. Low vegetation and low water in the Ken and Baghain rivers add to the heat." What is unfolding in the drought-prone district is the gradual creation of a heat trap - a landscape where forests have disappeared, rivers have weakened, groundwater has retreated and exposed land absorbs and radiates heat with growing intensity. "Shrinking green cover is linked to more frequent and intense heatwaves. Deforestation and mining are removing tree cover and degrading rivers. In Banda there is less shade and less water," said Prof Dutta. "Banda is traditionally known for high temperatures due to its geology, but now it is about heat stress as night temperatures have also been constantly rising. This has reduced the diurnal variation, causing immense heat stress for people," said KJ Ramesh, former director-general, Indian Meteorological Department (IMD). Additionally, global warming has increased moisture levels over the Indo-Gangetic Plains. Rising heat stress has increased power demand while limited access to cooling infrastructure in Bundelkhand adds to health risks, Ramesh said. "Lucknow itself has seen humidity levels reaching 57-69%, with the IMD warning that heat and humidity together are making the summer harder to endure. Uttar Pradesh's major river systems normally help moderate temperatures, but with rivers shrinking and rainfall remaining scarce, heatwave conditions are persisting," said Anjal Prakash, professor of public policy at Flame University. Researchers say the district has steadily lost many of the natural systems that once moderated temperatures. Prof Dinesh Saha of Banda Agriculture University said mining has accelerated river degradation and reduced groundwater recharge, while deforestation has weakened moisture retention. While heat traps are commonly associated with cities, experts warn that rural landscapes can also become heat islands when ecological systems collapse. In Banda, forest loss, shrinking rivers, falling groundwater levels and mining have converged to create a landscape that heats rapidly during the day and struggles to cool after sunset. A research by Banda Agriculture University found the district lost nearly one-sixth of its dense forest cover between 1991 and 2022. A separate 2025 study involving researchers from multiple universities reported a 17.55% decline in dense forest cover and warned that parts of the district could become barren within two decades if degradation continues. "Trees function as natural cooling systems. They provide shade, release moisture into the atmosphere through evapotranspiration and slow hot winds. When trees disappear, these cooling mechanisms disappear with them," said Prof Dhruv Sen Singh, head of geology department, Lucknow University. Environmentalists say excessive mining and blasting have further damaged the region's natural cooling systems. Dust from stone crushers settles on vegetation and soil, while the destruction of porous sandstone formations in the Vindhyan hills weakens groundwater recharge. The same pattern is visible in the Ken River, a lifeline for Bundelkhand. Water conservation expert Uma Shankar Pandey said stretches that once held water through much of the year are now reduced to shallow channels during summer. Groundwater decline has compounded the crisis. Scientists note that moist soils, vegetation and water bodies help regulate temperature. As groundwater levels fall, landscapes become hotter and drier, creating a cycle in which heat accelerates water loss and water scarcity intensifies heat. Local ecological degradation alone, however, does not explain Banda's record-breaking temperatures. Climate change is raising the baseline. Historically, Bundelkhand's semi-arid climate was characterised by hot days followed by cooler nights. But studies show night-time temperatures are rising faster than daytime temperatures in many regions. Prof Dhruv Sen Singh said Banda's vulnerability is being intensified by forest loss, shrinking water bodies, exposed sand surfaces and hot westerly winds from the Thar Desert. "The surface gets heated all day and even before the heat subsides at night, the next day begins," he said. Experts argue that the trend can still be reversed through stronger regulation and ecological restoration. Illegal sand mining and excessive blasting must be curbed, forests protected, and groundwater recharge zones safeguarded. Heat Action Plans also needs to expand into rural areas through early-warning systems, village-level water security plans and heat-resilient infrastructure....