Inside the Guian Data Center of China Unicom, which uses artificial intelligence in its operations.

Generative artificial intelligence uses massive amounts of energy for computation and data storage and billions of gallons of water to cool the equipment at data centers. Now, legislators and regulators — in the U.S. and the EU — are starting to demand accountability.

By David Berreby

Biodiversity

How DNA from the Dead Is Helping Boost Species on the Brink

Historical and ancient DNA from museum specimens is enabling scientists to establish baselines of genetic diversity for species in decline. That information is guiding key decisions on how best to protect imperiled wildlife, from Galápagos tortoises to African rhinos.

By Aisling Irwin

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Monarch butterfly.

CONSERVATION

Rethinking Monarchs: Does the Beloved Butterfly Need Our Help?

The Eastern monarch butterfly has long been thought to be in peril, but new studies indicate that its U.S. populations are not in decline. Scientists say the biggest threat the species faces is from well-meaning people who rear the butterflies at home and release them.

By Janet Marinelli

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