The conservative legal challenge to President Barack Obama's executive action on immigration, in line for U.S. Supreme Court review, would force the justices to wrestle with their own conflicting votes on when states have a legal right to sue the federal government.
U.S. President Barack Obama on Friday rejected the proposed Keystone XL oil pipeline from Canada in a victory for environmentalists who have campaigned against the project for more than seven years.
The New York attorney general has launched an investigation into whether Exxon Mobil Corp (XOM.N) misled the public and shareholders about the risks of climate change.
Canada's Prime Minister-designate Justin Trudeau, who came from behind to trounce his Conservative rivals and snatch a majority mandate, now has to deliver on pledges from tackling climate change to legalizing marijuana.
