A recent analysis indicates that about half the global population, or 4 billion people, faced unprecedented extreme heat due to human-induced climate change from May 2024 to May 2025. This extreme weather has resulted in numerous health complications, crop failures, and has stressed public services, notably in regions such as the Caribbean. The report underscores that heat is a primary cause of extreme event fatalities, often underreported. The research further reveals that globally, the incidence of extreme heat days has doubled, highlighting the significant impact of climate change on weather patterns.
The extreme heat caused illness, death, crop losses, and strained energy and health care systems, highlighting that heat is arguably the deadliest extreme event.
The scientists used peer-reviewed methods to study how much climate change boosted temperatures and calculated the increased likelihood of extreme heat events due to climate change.
In almost all countries in the world, the number of extreme heat days has at least doubled compared with a world without climate change.
Charlotte Gossett Navarro described the unbearable heat in Puerto Rico, indicating it hindered simple outdoor family activities and exacerbated health issues.
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