President Obama announced Sunday that he’ll use his executive authority to designate 12 million acres in Alaska’s Arctic National Wildlife Refuge (ANWR) as wilderness, walling it off from resource development. This abrogates a 1980 deal in which Congress specifically set aside some of this acreage for future oil and gas exploration. It’s also a slap at the new Republican Congress, where Alaska Sen. Lisa Murkowski has been corralling bipartisan support for more Arctic drilling.