Biden criticizes Steyer’s coal-mining investments after billionaire promises to fight climate change

At Wednesday night’s Democratic presidential debate in Atlanta, billionaire activist Tom Steyer tried to stake out a spot as the leading candidate on climate change — a role that has more or less been up for grabs since Washington Gov. Jay Inslee dropped out of the race. But Steyer also took a shot from former Vice President Joe Biden for his past investments in coal mining.