Not paying attention to the perils of climate change because, well, it's simply not funny enough?

David Letterman and U.S. Sen. Al Franken, D-Minn., have teamed up for a series on climate change on Funny or Die with the goal of tackling the topic humorously.  We can't say they always succeed, but they give it a try.

The series of six videos, Boiling the Frog, was produced along with a team from the documentary series Years of Living Dangerously on the same topic. (Here's a Q&A with the duo)

In the second episode, Franken tries to explain the impact of the Koch brothers, describing them as "Siegfried and Roy."

Kinda funny.

Then, Franken goes on to explain the impact of Charles G. and David H. Koch – the real brothers – and their ability to pour money into a political fight.  Koch Industries, with billions in revenue, is the second largest privately held country in the U.S. and operates oil refineries and pipelines.

"My Republican colleagues are afraid of them," Franken tells the long, white-bearded Letterman. "They fund Heritage Foundation and all these climate denying and fake science outlets.

Okay, not so funny.

And, if you don't recall, the term boiling the frog refers to a cautionary parable.  In it, a frog is placed in a pot of boiling water and hops right out. But, when the frog is placed in room temperature water it remains as the heat slowly gets turned up until it's too late for it.  The story is often used to suggest people really don't pay attention to what's really going until it's too late.