A PAC representing wind and solar energy interests spent $1.1 million to boost the Republican primary opponent of Chip Roy, an opponent of renewables. Now they are trying to save a Republican ally in Iowa.

A PAC representing wind and solar energy interests spent $1.1 million to boost the Republican primary opponent of Chip Roy, an opponent of renewables. Now they are trying to save a Republican ally in Iowa.

© Michael A. McCoy for The New York Times

The dream of clean hydrogen has tantalized energy experts for years, but producing it has been tough. Many start-ups think the answer could lie beneath our feet.

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

© Eduardo Munoz/Reuters

Renewable energy has helped make the worst-case scenario a bit less bad. The president said, falsely, it shows that climate scientists were wrong all along.

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