Past abrupt climate change in the North Atlantic could have started as far south as China, scientists say.

Leaves mostly keep their cool (or warmth) wherever they live, a finding that might affect reconstructions of past climates.

Why fights are likely to break out in the next few months to years between industry, environmental advocates, and the feds as regulations are developed, and litigated, over how to conserve declining numbers of polar bears.

The media-affairs office in federal agencies can be fairly obstructionist, and when they do, the public comes out the loser.

Long-delayed U.S. government summary of climate change science sees effects on energy, transportation, farming, and water.

Upwelling off Californian coast offers taste of predicted ocean acidification.

Yesterday, I reported that in hopes of slowing down global warming, some nations were interested in strengthening the Montreal Protocol – a United Nations treaty to curb releases of chemicals that endanger stratospheric ozone. But I didn’t really get into what they had up their sleeves. It turns out they want signatory nations to eliminate a loophole: a failure to regulate coolants in existing refrigerators and air conditioners and the fluffing-up constituents of some plastic foams. Old fridges, A/C units, and foam all tend to get sent to landfills or other graveyards of past-their-prime ...

A protein chemist reported he had assembled a list of more than 30,000 scientists who challenge the idea that human releases of greenhouse gases are warming Earth's climate.

Quick: What’s the name of the big UN global climate treaty? If you said the Kyoto Protocol – you’d be wrong. Because it’s a trick question. Although the Kyoto Protocol is indeed the treaty developed to address the issue of arresting global warming and the climate perturbations that will be spawned by such a growing planetary fever, this treaty has yet to actually accomplish much in terms of putting a brake on warming. Indeed, it hasn’t even gotten the United States to sign on yet, and discussions among active parties to the treaty have been languishing. The only treaty to have had...

As forests move northward and to higher elevations, they alter ecosystems and threaten to further heat the Arctic's already warming climate.

Polar bear declared "threatened," but Secretary limits decision's impact.

A kilometers-long ice core from Antarctica has been recording climate information for the past 800,000 years and has revealed a three millennia–long period when carbon dioxide levels in the air were lower than any previously measured.