Not much. A few tenths of a degree. But there’s a lot at risk.

The problem is that we’re putting a global economy with present value of $2,000 trillion at risk to go after less than $4 trillion of expected present value of benefit. The desire to regulate the global economy to avoid the risk of catastrophic climate change is not a one-sided bet.

Anybody outside California is asked to ponder this: Do you really want the whole country going the way this state is going?