Dec 2016:  U.S. President Barack Obama on Tuesday banned new oil and gas drilling in federal waters in the Atlantic and Arctic Oceans, in a push to leave his stamp on the environment before Republican Donald Trump takes office next month. Obama used a 1950s-era law called the Outer Continental Shelf Act that allows presidents to limit areas from mineral leasing and drilling. Environmental groups said that meant Trump’s incoming administration would have to go court if it sought to reverse the move.

The ban affects 115 million acres (46.5 million hectares) of federal waters off Alaska in the Chukchi Sea and most of the Beaufort Sea and 3.8 million acres (1.5 million hectares) in the Atlantic from New England to Chesapeake Bay.