The Obama administration called hydrofluorocarbons widely used in refrigerators and air conditioners “a very significant” threat to climate change Monday, and expressed a preference for drastically reducing HFCs that are promoted under the U.N.’s ozone tr

Two small island nations, worried by rising sea levels, proposed drastic global cuts Thursday in the use of hydrofluorocarbons, a class of powerful greenhouse gases commonly used as coolants in refrigerators and air conditioners.

The Obama administration, in a major environmental policy shift, is preparing to ask 195 nations that ratified the U.N. ozone treaty to enact mandatory reductions in hydrofluorocarbons, according to U.S. officials and documents obtained by The Associated

Here’s rare good news about an environmental crisis: We dodged disaster with the ozone layer.

This year’s ozone hole over Antarctica was the fifth biggest on record, reaching a maximum area of 10.5 million square miles in September, NASA says.

This year’s ozone hole over Antarctica was the fifth biggest on record, reaching a maximum area of 10.5 million square miles in September, NASA says.

The rule of unintended consequences threatens to strike again. Some researchers have suggested that injecting sulfur compounds into the atmosphere might help ease global warming by increasing clouds and haze that would reflect sunlight.After all, they...

A regional nuclear war would not only be devastating to the countries involved, it would cause havoc worldwide for at least a decade, according to a new analysis.The massive fires resulting from even a limited conflict would blast enough soot into the...