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Story summary
- The International Institute for Environment and Development reports a 25% rise in extremely hot days in major cities since the 1990s.
- In Rome and Beijing, days above 35°C have doubled, while Manila's have tripled.
- The Urban Heat Island effect makes cities 10°–20°F hotter than surrounding areas.
- The findings link heat to more heat-related deaths and intensified weather events.
- Mitigation includes expanding green spaces, white roofs, and smarter urban design.
