I thought this showed Paul at his very best (dk).  And this is after seeing or hearing two hundred or more of his videos and podcasts.  When Paul is on, he is REALLY on.  Shows his mastery of teaching.  Followed by three similarly great videos.  Four videos:

Learn to Calculate Earth’s Equilibrium Temperature // Published on Apr 25, 2017

Impress your friends. Get lots of admiration and be the star of the party.  People will be lining up for your autograph, or a date…

I show you how to calculate the equilibrium temperature of the Earth.

All that you need is the Stefan-Boltzmann Equation from 1883 and some information on the surface area of a sphere.
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Accelerating Effects of Arctic Feedback: 1 of 2 // Published on Apr 25, 2017

For years, my climate scientist hero has been James Hansen. More recently, Peter Wadhams from Cambridge in the U.K. has become a hero-among-equals with Hansen, especially with his brilliant book“A Farewell To Ice“, of which he sent me an autographed copy.

I discuss numerous feedbacks turning the Arctic icebox into a frigging sauna-on-steroids; including some that Peter does not cover.
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Accelerating Effects of Arctic Feedbacks: 2 of 2 // Published on Apr 27, 2017

There are numerous powerful amplifying feedbacks in the Arctic, causing the temperatures there to skyrocket. This has profound implications to humanity, including enormous threats to our global food and fresh water supplies.
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Arctic Methane: A Catastrophe in the Making // Published on Apr 28, 2017

Up to 2005, the oceans over the shallow continental shelves in the Russian Arctic (ESAS, Laptev) were ice covered, keeping the -100 meter deep oceans near freezing temperatures.

Since 2005, the ice cap cover has gone. The water has warmed as high as 17 degrees C there in summer, heating the sea-floor, perforating the permafrost cap, and thawing methane hydrates. Ebullition (bubbling methane) is rising up the water into the atmosphere in ever increasing amounts.
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