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Ken Caldeira is trying to come up with a big solution to the problem of increasingly acid oceans: antacids for coral reefs. That might keep the reefs from being destroyed by humans' use of fossil fuels. And that's not his only big idea. But even Caldeira admits that his audacious plan could fail.

Rep. Lamar Smith (R-Texas), Chairman of the House Committee on Science, Space and Technology, discusses the nation's top science priorities, including the importance of research on how to protect Earth from dangerous asteroids. But in a tight budgetary climate, who will pay?

The presidential campaign has brought an unlikely candidate to the fore. Macron, a former banker and former economy minister, is surging in the polls. His message: Embrace innovation and risk.

Federal maps help determine who on the coast must buy flood insurance, but many don't include the latest data. Maryland is now making its own flood maps, so homeowners can see if they're at risk.

We asked doctors, researchers and aid workers to look into the future. Here's what they foresee.

Russia has been less aggressive in Germany's election than it was in the U.S. or France. Chancellor Angela Merkel remains favored — but the Kremlin still could leave its mark.

Though a quarter of the country is below sea level, the Netherlands has kept itself dry with ingenious water management. A recent innovation: an artificial sand peninsula that keeps the sea at bay.

Politics in Haines, Alaska — population 2,500 — has grown intensely bitter lately, reflecting the volume and heat of national politics.

The Democratic "unity tour" has produced less-than-unifying headlines for the out-of-power party as progressives seek to oppose President Trump and the GOP.

Most mornings and afternoons, a newly built footpath that plunges through a grove of towering redwoods is clogged with workers and school kids.