In a speech on renewable energy, António Guterres cited “clear market distortion” in favor of fossil fuels by President Trump and others but called the transition to cleaner energy economically inevitable.

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After Trump pledged to open international waters to mining, The Metals Company sought U.S. permits. But other countries are raising legal concerns.

© Tamir Kalifa for The New York Times

Scholars and designers of early warning systems say that there are still huge gaps in our ability to predict flash floods and warn those at risk.

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