Sen. Al Franken (D., Minn.) teamed up with comedian David Letterman for a new web series on climate change titled "Boiling the Frog with Senator Al Franken."
The series was created by Funny or Die and the team behind "Years of Living Dangerously," a documentary series about climate change in which Letterman also appeared.
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Each episode is only a few minutes long and features Franken teaching Letterman about climate change.
"For a series of video exploring the reality of climate change and threat it poses to our very way of life. So please, like and share this video and stay tuned for more," Franken says in the first episode.
In a preview for the second episode, viewers hear Franken say, "It's really the Koch brothers."
In the same episode, Letterman asks Franken, "The Koch brothers, what are they trying to achieve via this?"
"They just want to be able to feel secure in their retirement," Franken jokes before saying, "I think it's kind of power."
Speaking about climate change, Franken says, "Anyone who is saying this ain't real is talking through his butt."
In episode three, Franken brings in fellow Democratic Sen. Sheldon Whitehouse (R.I.) to explain carbon pricing to Letterman.
"Every Republican that has worked this through to a solution out there, essentially all of them come to the same solution" of a revenue-neutral carbon tax," Whitehouse claims.
Franken in the last episode references conservative radio host Rush Limbaugh for saying sea levels do not rise from melting ice.
According to Franken, Limbaugh came to this conclusion saying if you have a glass of water with ice, the level just stays the same.
"And Rush made that observation I'm sure watching ice melt in a cocktail," Letterman adds.
At the end of the last episode, Franken says, "I don't want to take so much time with this that it looks to people like I'm not doing my job," before wrapping up with an anecdote about joining the Senate to end the series.