Climate change will make some of the holiest cities on the planet so hot they are uninhabitable, Al Gore said at a summit in Atlanta.

The former vice president stepped in to resurrect the conference on climate change and public health after it was scrapped by the Centers for Disease Control and Prevention in the aftermath of Donald Trump’s election. Trump is a noted climate change skeptic.

Gore steered away from politics and stuck to science at the event Thursday, which was moved to the Carter Center.

Jimmy Carter - who put in a brief and unannounced appearance - said he was happy to host.

“The CDC has to be a little cautious politically,” the former president said. “The Carter Center doesn’t.”