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Science / Our Planet

As ocean water becomes more acidic, corals and shellfish must spend more energy to make their calcium carbonate shells.

A Swim Through the Ocean’s Future

Can a remote, geologically weird island in the South Pacific forecast the fate of coral reefs?

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Sunspots and Climate

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Death from the Skies!

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Picture of the Week—Project Pebble

The University of Cambridge Department of Engineering hosted a photography contest earlier this year, and the winners have just been announced

In the '80s, the challenge was to limit acid rain from power plants; now, it's to cut carbon emissions.

The Political History of Cap and Trade

How an unlikely mix of environmentalists and free-market conservatives hammered out the strategy known as cap-and-trade

Meteor Crater in Arizona is 4,000 feet wide and almost 600 feet deep.

The Ten Most Spectacular Geologic Sites

Smithsonian picks the top natural wonders in the continental United States

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Weather vs. Climate

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