Ice Age North Atlantic Temperatures, Tropical Oceans Linked...

Energy companies offered a total of $13.86 million for rights to explore 81 tracts in part of the National Petroleum Reserve-Alaska, a vast federal land valued for Arctic wildlife as well as oil and gas potential.

British billionaire Richard Branson proposed on Wednesday changes to aircraft movements at busy airports and the way planes land under a plan he said would cut the world's aviation carbon emissions by up to 25 percent.