Hundreds of kayaktivists protest drilling in the Arctic and the Port of Seattle being used as a port for the Shell Oil drilling rig Polar Pioneer (Daniella Beccaria/seattlepi.com via Associated Press)

President Obama moved to solidify his environmental legacy Tuesday by withdrawing hundreds of millions of acres of federally owned land in the Arctic and Atlantic Ocean from new offshore oil and gas drilling.

Obama used a little-known law called the Outer Continental Shelf Lands Act to protect large portions of the Chukchi and Beaufort seas in the Arctic and a string of canyons in the Atlantic stretching from Massachusetts to Virginia. In addition to a five-year moratorium already in place in the Atlantic, removing the canyons from drilling puts much of the eastern seaboard off limits to oil exploration even if companies develop plans to operate around them.

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