Four billion endured extra month of extreme heat due to climate change – report

The scientists used peer-reviewed methods to study how much climate change boosted temperatures in an extreme heat event (Alamy/PA)

Four billion people, about half the world’s population, experienced at least one extra month of extreme heat because of human-caused climate change from May 2024 to May 2025, scientists have said.

The extreme heat caused illness, death, crop losses, and strained energy and healthcare systems, according to the analysis from World Weather Attribution, Climate Central and the Red Cross.