It is humanity's fault, at least according to the same scientists that say it is happening, which is nearly every climate scientist with only a few isolated exceptions. A survey of climate studies completed last year found that 97 percent of 4,000 studies blamed human activity for warmer temperatures — more greenhouse gas emissions from fossil fuel-burning leading to more heat trapped in the atmosphere. Roker is wrong.

That was an error before the discussion even began, compiled when host David Gregory showed a snippet of a climate change denier from the Cato Institute, which was completely wrong. (He claimed that people lived more places which explained an increase in expensive disasters. Which doesn't explain the big increase in such disasters in the U.S.)

So what did the guests have to say? After Blackburn reminded people that Bill Nye was "an engineer and actor," she insisted that they look at "the information that we get from climate scientists." Here are the show's other factual assertions, in chronological order.

Blackburn:

Even the president’s own Science and Technology Office head Mister Holdren says no one single weather event is due specifically to climate change.

Rating: True

In fact, almost every scientist says that no single weather event is due to climate change specifically. Climate and weather are not the same thing: the former addresses long-term trends; the latter, short-term events. (This video offers a terrific visualization of the difference.) So while climate change will mean more of certain types of events — rainier storms, more ferocious hurricanes, more flooding — they themselves don't prove climate change. Blackburn's both responding to how Gregory framed the segment, using recent weather events as a news hook, but also intentionally trying to suggest that there's no link between weather and climate. Which, in the aggregate, there is.

Or, as Nye says in his rebuttal: "That you cannot tie any one event to that is not the same as doubt about the whole thing."

Blackburn:

And when you look at the fact that we have gone from 320 parts per million 0.032, to 0.040 four hundred parts per million, what you do is realize it’s very slight.

Rating: False

Blackburn tries to downplay the amount of carbon dioxide in the atmosphere by talking about the amounts in very, very small decimals. Which they are: If I took $400 versus $320 out of your million dollars, you wouldn't be terribly upset.

But that's intentionally misleading. The difference between the two is an increase of 25 percent over the past 50 years — after thousands and thousands of years of it being lower. Last year, The New York Times explained that the level of carbon dioxide now in our atmosphere is a "concentration not seen on the earth for millions of years." And at that point, "the world’s ice caps were smaller, and the sea level might have been as much as 60 or 80 feet higher."