“While the Koch brothers admit to not being experts on the matter, these billionaire oil tycoons are certainly… experts at contributing to climate change. That’s what they do very well. They are one of the main causes of this. Not a cause, the main cause,” Reid said.

Now in his fifth month of flogging the billionaire conservative benefactors on the Senate floor, Reid dubbed them “multizillionaires” on Wednesday and mockingly applauded their spokeswoman for saying the Kochs and the energy conglomerate that they run aren’t experts on climate science. Wealthy liberal investor Tom Steyer challenged the Kochs to a debate on climate change last week in a full-page newspaper advertisement, but they declined to take him up on it.