US President Joe Biden has announced $2.3bn (£1.9bn) to help build infrastructure that can withstand extreme weather and natural disasters.
But he stopped short of formally declaring a climate emergency, which would grant him further powers.
Tens of millions of people in the US, across more than two dozen states, are living under heat warnings this week.
Meanwhile wildfires continue to rage in parts of Europe as a heatwave moves across the continent.
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