But his visit to the United States could change all that.
A new study suggests we have a fighting chance to avoid catastrophic warming.
In a joke-packed speech to the White House Correspondents' Association, Obama got so "angry" at climate deniers that he scared off his "anger translator."
A new study suggests China's tough new pollution standards might actually be working.
By next year, nearly half of global GDP will be covered by cap-and-trade programs.
Its massive new installation will produce enough power to supply 60,000 California homes, says CEO Tim Cook.
New research shows Midwest flooding has become more frequent over the last 50 years -- so now the government is scrambling to get a risk management plan in order.
That really is a lot of people; it’s roughly equal to the population of Orlando, Fla., or Buffalo, N.Y.
Australian Prime Minister Tony Abbott could soon be booted from office.