Probably to hit the blue collar workers of America.
Check it out:

Speaking in New York City last week, Wall Street billionaire Tom Steyer laid clear his vision for penalizing people whose actions may contribute to climate change.

“We need to reward people whose behavior reduces climate risk and penalize people who add to it,” said Steyer “If we can get this right, I think there’s no doubt that our economy is going to continue to do very well.”

He was joined by several wealthy businessmen — such as Michael Bloomberg and former bankers and government officials Hank Paulson and Robert Reich— to unveil a report from Risky Business, an economic analysis of the financial impact to be caused by climate change.