In the final episode of the season, Donnie and Chris talk about what they've learned, the terrifying awesomeness of the universe, climate optimism, Halloween candy, and where the podcast is going next!

Featuring only the Stemp brothers, without any pesky scientists or climate experts getting in the way. Plus the news of the week. Stay in touch over the break at weekonearth@gmail.com!

This week we hitch a ride on the International Space Station to monitor and understand our CO2 emissions. And we finally get an answer to our question, does our breathing contribute to climate change?

Featuring Dr. Abhishek Chatterjee, the project scientist for the Orbiting Carbon Observatory 3 at JPL. Plus, the latest climate news of the week.

In the thrilling conclusion of our three-episode series, we learn about the next generation of cutting edge refrigerants, and go shopping for Donnie's new AC unit.

Featuring Phil McKenna of Inside Climate News and Christina Theodoridi of the NRDC. Plus, the latest climate news of the week!

So what happened after we saved the ozone layer? We moved on to another destructive chemical, this one causing climate change. But brand new developments have produced another massive climate win against HFCs! Is it enough?

Featuring NRDC policymaker Christina Theodoridi, Inside Climate News reporter Phil McKenna, and documentary director Jamie Lochhead. Plus the climate news of the week.

Or Chris's alternate title, "Ozone: A Big-ass Hole." The astounding story of how the planet came together to solve the pressing environmental issue of its time (under conservatives Reagan and Thatcher, no less!). With the dire threat of climate change looming, what can we learn from this story going forward?

This episode features Jamie Lochhead, the director of the PBS documentary 'The Hole: How We Saved the Planet." Plus the latest climate news of the week.

Or, how to suck carbon. In this episode, Donnie and Chris try really hard to understand CO2, our most prolific greenhouse gas. Featuring UCLA scientist and X-Prize winner Dr. Gaurav Sant from the Institute of Carbon Management, and Mike McGee, the creator of CO2.earth. Plus the latest climate news.

A Week on Earth Whodunit! In this episode we explore the controversy around the push for electrification of the USPS mail fleet. Featuring Katherine Garcia of the Sierra Club, Britt Carmon and Frank Sturges of the NRDC, University of Michigan scientist Max Woody, and, the "evil postmaster general" himself!

Also, the brothers reminisce about the time Donnie crashed his car into mailboxes, and a roundup of the week's environmental news.

50 years of recycling messaging and we still can’t recycle properly in the USA. What on earth is going on?

This episode features Mitch Hedlund, Founder and Executive Director of Recycle Across America, on the reasons why recycling remains unsuccessful,  Franziska Trautmann, co-founder of Glass Half Full NOLA, on the creation of the first glass recycling and coastline restoration facility in New Orleans, and our very own Uncle John, the unofficial mayor of Santa Barbara, on his town’s advanced new recycling facility. Plus, the week's latest climate news.