What do you get when you combine Al Gore, climate change and a Bob Dylan quote?

A Democratic National Committee fundraising email.

The former vice president was the nominal "sender" of a blast email Tuesday touting President Obama's push to address climate change, largely through a proposal to limit carbon emissions from power plants. The email also slammed lawmakers who deny or are skeptical of the scientific consensus that humans drive climate change, largely through burning fossil fuels.

"[Y]ou and I both know there are still a lot of deniers out there. The time for leadership in the face of this threat has not passed. If ever there were a moment to send leaders to Washington who make climate legislation their top priority, this is it," the email said, following a line from Dylan's 1965 track "Subterranean Homesick Blues."

Choosing Gore for the email might seem a natural fit, given the topic. After all, he's made a second career out of prodding politicians on climate change.

But Obama has been one of the politicians Gore has criticized.

Gore was often critical of the president for doing too little on climate change while talking a big game. Some of the Obama administration's accomplishments listed in the DNC email — such as emissions limits on vehicles and green stimulus spending through the American Recovery and Reinvestment Act — occurred when Gore was still somewhat dismissive of the administration's climate efforts.

Gore's tune changed a bit, however, following Obama's second inauguration speech in January 2013, when the president went into detail about the problems climate change posed for future generations. Obama followed that up with a sweeping climate change speech that June, and a year later proposed cutting power-sector emissions 30 percent below 2005 levels by 2030.