Record El Niño? Depends who's counting

Britain's Met Office says this year's El Niño is "unprecedented." Japan's weather agency has called it the strongest ever observed. U.S. forecasters say it still trails the biggest events in its record books.

The ambiguous costs of climate change

As human activity has increased temperatures globally, determining the costs directly incurred by climate change is challenging. The effects of climate change on extreme weather events—such as hurricanes and heat waves—can ...

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