UNEP’s recent feature “Boiling Hot” argues that extreme heat—once rare—is increasingly common and deadly, driven by unchecked greenhouse gas emissions and placing billions at risk. It outlines practical solutions that are simultaneously effective and low‑carbon, including urban greening, passive cooling (like reflective roofs and natural ventilation), upgraded heat‑health early warning systems, and policy tools such as national strategy roadmaps and the UN Cool Coalition to support sustainable cooling. 

Source: United Nations Environment Programme (UNEP)