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This is the Tom Hartman program.

The line with us is our old buddy Dr. Michael Mann, the distinguished professor and director of

the Center for Science, Sustainability and the Media at the University of Pennsylvania, author of

numerous books, most recently The New Climate War.

Michael Mann with 2Ns.net is his website, his Twitter handle is Michael E. Mann with 2Ns.

And Dr. Mann, welcome back to the program.

At Fort Lauderdale, it's got 25 inches of rain in less than seven hours.

This is, I believe, unprecedented, wild tornadoes ripping up the Midwest in the south,

areas that it appears that the bad weather, the historically bad weather, tornado-wise,

anyway, that they used to be in Kansas is now in Alabama and Georgia and Tennessee and Kentucky.

What's going on here?

This is just another example of something that we've been talking a lot about in recent years.

We're seeing these far more extreme flooding events.

And it's one of the most basic relationships in all of atmospheric science that tells us

is you increase the warmth of the oceans, you increase the moisture in the atmosphere by about

...