"In the midst of a lot of big, bad things happening, there's one big good thing happening on planet Earth right now."

Today on A Matter of Degrees, we're bringing back the podcast's very first guest — legendary activist and author Bill McKibben. Bill's latest book, Here Comes the Sun: A Last Chance for the Climate and a Fresh Chance for Civilization, shows how clean energy can create a healthier, safer, more prosperous world.

Bill is also organizing "Sun Day" – a national day of action on September 21st to celebrate the power of clean energy. You can get involved in an event in your area by visiting SunDay.earth

In this episode, Bill takes us through the history of solar – how it became the cheapest energy on earth, its potential to transform our lives, and how we can harness it to heal our planet.