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Intelligence agencies are debating the effects of climate change on national security. A classified assessment delivered to Congress concludes that rising global temperatures would indirectly present a security threat to the United States.

Thursday in Pittsburgh, Republican presidential candidate and former Massachusetts Gov. Mitt Romney appeared to shift his position on climate change. Speaking at the Consol Energy Center, he said, "My view is that we don't know what's causing climate change on this planet." In his book No Apology and in earlier public appearances, Romney has said that he believes climate change is occurring — and that humans are a contributing factor. At a campaign appearance in New Hampshire back in August, Romney emphasized questions about the extent of the human role. But his remarks in Pittsburgh represent a clear shirt toward a skeptical position on the causes of climate change.

Climate-warming greenhouse gasses from natural gas could be as damaging as those from coal, according to a new analysis.

Hillary Clinton said Tuesday that she now opposes building the Keystone XL pipeline. See where the other candidates stand.

ProPublica senior reporter Andrew Revkin discusses President Trump's possible cuts to the EPA, as well as the potential impact of pulling out of the Paris climate accord.

A study finds tiny leaks from loose fittings added up to more emissions than when stoves were in use. The impact of U.S. gas stoves on climate change amounts to the same effect as a half-million cars.

Several big farm groups, traditionally hostile to environmental regulations, are now working with environmental advocates in support of farmer-friendly actions to reduce carbon emissions.

Through climate science, we learned to read entire worlds — and no one can take that achievement from us: We are greater for what we have built with this knowledge, says astrophysicist Adam Frank.

The central U.S. just experienced the most widespread river flooding ever recorded there. Flood defenses in major cities largely performed well, but many smaller communities were simply overwhelmed.

NPR's Ari Shapiro talks to Ben Santer, a climate scientist at the Lawrence Livermore National Laboratory, about his open letter to Donald Trump on climate change.