Democrat presidential candidate Joe Biden endorsed a carbon tax tonight during a CNN town hall. 

Here’s the key exchange:

CNN’s Anderson Cooper: “Would you support a carbon tax? Some other candidates say they would.

Biden: “Yeah, no, I would.

A Biden carbon tax would significantly increase household costs such as cooling and heating, transportation, and groceries, 

Carbon taxes are highly unpopular with voters. In fact, carbon tax advocates can’t even get a carbon tax passed in a single blue state, as this timeline shows.

Carbon taxes also saddle state and local governments with huge costs. For example, a school district in Calgary was forced to kick 400 kids off the school bus program in order to pay a $3.3 million carbon tax bill.

It’s no wonder conservative groups wrote a letter to Congress stating: “We oppose any carbon tax.”