The extreme heat smothering Europe has upended Climate Week in London.

© Pool photo by Yui Mok

Many philanthropists are backing away from climate giving. But one is writing very big checks.

© Justin Tallis/Agence France-Presse — Getty Images

Many philanthropists are backing away from climate giving. But one is writing very big checks.

A new wave of start-ups are trying to harvest emissions-free energy from inside the Earth, but the industry still faces significant challenges.

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