New York: Four rapidly emerging threats could reshape life for millions unless urgent action is taken. From ancient microbes awakening in melting glaciers to toxic pollutants unleashed by floods, the dangers are no longer distant or theoretical. They are here, and they are growing.
According to United Nations, the Frontiers Report 2025 released by the UN Environment Programme (UNEP) highlights four critical areas where environmental degradation intersects with human vulnerability: legacy pollution, melting glacier microbes, undamming rivers, and climate risks for an ageing population that is growing. Climate scientists emphasize that many glaciers will not survive this century unless action is taken to slow the melting rate caused by climate change. As global temperatures hit record highs, microorganisms frozen in ice sheets, glaciers, and permafrost will become more active in many ecosystems, posing potential threats.
Efforts must assess and prepare for possible threats from potential pathogens, even if the melting can be slowed down by mitigating greenhouse gas emissions. Preserving cryospheric microorganisms is crucial, as they can provide insights into climate history and evolution, aid in disease therapies, and develop biotechnologies. The report also highlights the need to dismantle dams to rehabilitate river ecosystems, as droughts exacerbate problems in regions like the Colombian Amazon, where river water levels have dropped significantly.
The UN Childrens Fund (UNICEF) reports that drought is keeping more than 420,000 children out of school in Brazil, Colombia, and Peru alone. Consequently, the removal of dams and other barriers is increasingly initiated by local communities, Indigenous Peoples, women, and youth. Understanding the outcomes of barrier removal is necessary to guide future removals and inform decisions about existing and future barriers.
Older populations face increased risks during extreme weather and environmental degradation. The World Meteorological Organization (WMO) predicts more hot weather, disproportionately affecting the elderly. The global share of people over 65 years old will rise from 10 per cent in 2024 to 16 per cent by 2050, necessitating effective adaptation strategies to protect these vulnerable populations.
Flooding has become a significant concern worldwide, with extreme weather events releasing legacy pollutants that have been secreted into the ground over time. Events like the Pakistan floods of 2010, flooding in the Niger Delta in 2012, and Hurricane Harvey in 2017 exemplify how floodwaters can release heavy metals and persistent organic pollutants. Evaluating sediments to understand hazards and investing in natural remediation are potential solutions to address this issue.