NOAA scientists used three methods to predict when summers in the Arctic will be almost ice-free. Looks like it will happen by 2040, and maybe by 2020.
Minneapolis took top honors in the Trust for Public Land's second-annual ParkScore Index, which ranks cities on the quality, quantity, and accessibility of their parks.
After Alaskan leaders slashed the state's tax on oil companies, BP announced that it will ramp up investment and bring new oil rigs to the North Slope.
Major global airlines have agreed on a proposal for reducing carbon emissions -- but it lacks details, aims low, and would sit on the tarmac until 2020 or later.
More than 40 countries now have a cap-and-trade system or carbon tax, or will soon -- and China, Brazil, and other emerging economies might soon join the club.
The U.S. still doesn't have a single offshore wind turbine. The Interior Department is trying to change that by auctioning wind leases off the coasts of Rhode Island and Massachusetts.
Fishermen and native groups want EPA to block the proposed Pebble Mine near Bristol Bay, one of the world's most productive salmon fisheries and home to vast reserves of gold and copper.
After a tornado outbreak, NOAA dropped its plan to force employees to take unpaid days off to deal with the sequester. But budget cuts will still have to come from somewhere.
Officials say the ban has spared the country 67 billion polluting plastic bags, though a study finds that many retailers are still ignoring the rules.