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Home World Climate, Environment & Energy

Heat waves put older persons at high risk, warns UN report

by Staff Correspondent
July 10, 2025
in Climate, Environment & Energy
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Bangladesh becomes 1st South Asian country to join UN Water Convention
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As extreme heat grips many countries and becomes “the new normal”, the UN Environment Programme (UNEP) warns of heightened health risks for older persons in the Frontiers 2025 Report published today. Other highlighted impacts of climate change include the melting of glaciers that reawaken ancient pathogens and floods that risk releasing dangerous chemicals.
The 7th edition of the Frontiers Report, The Weight of Time – Facing a new age of challenges for people and ecosystems, is part of UNEP’s Foresight Trajectory initiative and highlights emerging environmental issues as well as potential solutions. The first edition in 2016, warned of the growing risk of zoonotic diseases, four years before the COVID-19 pandemic. This report is released as communities across China, Japan, India, Europe, USA and elsewhere face weeks of extreme heat and flooding.
“Heat waves are among the most frequent and deadly impacts of climate change, along with floods and shrinking ice cover,” said Inger Andersen, Executive Director of UNEP. “We must be prepared for the risks these impacts pose, especially for society’s most vulnerable, including older persons. Yet as this year’s Frontiers Report shows, solutions exist that can help protect communities and restore ecosystems long-thought to have been lost.”
Adults aged 65 and above now form an increasingly dominant part of the world population, particularly in urban areas of low- and middle-income countries. The report notes that annual heat-related deaths among older persons have risen by an estimated 85% since the 1990s. Additional risks arise from deteriorating air quality and floods in low-lying coastal cities where older persons live.
Older persons — especially those with chronic illnesses, limited mobility, or frailty — are particularly vulnerable to heat-related health issues, including respiratory, cardiovascular, and metabolic diseases, as well as increased mortality.
The report recommends making cities pollution-free, resilient, and accessible spaces with expansive vegetation. Key strategies include better urban planning, community-based disaster risk management, and improved access to climate information for older populations.
Earlier this year, the UN Human Rights Council adopted a new resolution to develop an “international legally binding instrument on the human rights of older persons,” a possible path to add safety to those most exposed to climate change.
Zombie microbes
Beyond the risks to older persons, the report also warns of ancient microbes awakening. Should global temperatures rise more than 2˚C above pre-industrial levels, this would significantly reduce the cryosphere in mass, which includes glaciers, seasonal snow, ice sheets and shelves, sea ice, seasonally frozen ground, and permafrost. Cryospheric regions are home to 670 million people as well as to billions more who live in areas with water originating from those frozen areas.
Dormant fungi, bacteria, and viruses in these frozen regions could reactivate, raising the risk of antimicrobial resistance. To slow down the decline of the cryosphere, the Frontiers 2025 Report recommends cutting greenhouse gas emissions – including black carbon emissions from diesel engines, open-field agricultural burning, and wildfires – and limiting tourism in fragile frozen regions. The report also recommends accelerating scientific research into the diversity of cryospheric microorganisms that will not survive the cryosphere’s decline.
The return of banned chemicals through floods
The report also identifies risks from the remobilization of chemicals that were banned and phased-out decades ago. Floods can bring such chemicals to the surface, after having accumulated in sediment over centuries.
As floodwaters stir up sediment and debris, toxic chemicals may be released and re-enter urban areas or food systems. The report lists effective measures to reduce this growing risk: traditional control measures like polders, dikes and retention basins, improved drainage systems, nature-based solutions (e.g., sponge-city approaches), regular monitoring of pollutants in diverse locations and products, and economic impact studies about this type of pollution.
The risk of ageing dams
Another emerging threat the Frontiers 2025 Report addresses is the risk of ageing dams. Alongside many benefits, dams can harm indigenous and fishing-dependent communities, as well as degrade ecosystems. Removal of large, older dams that have become unsafe, obsolete, or economically unviable is increasingly happening in Europe and North America.
The report highlights potential benefits of the removal of dams and barriers in restoring natural river connectivity for biodiversity and ecosystems. Reversing river fragmentation and restoring natural processes support the implementation of the UN’s principles for ecosystem-restoration initiatives .
NOTES TO EDITORS
About the UN Environment Programme (UNEP)
UNEP is the leading global voice on the environment. It provides leadership and encourages partnership in caring for the environment by inspiring, informing and enabling nations and peoples to improve their quality of life without compromising that of future generations.

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