At a time when almost everything seems to be going wrong, Bill McKibben sees one thing that is suddenly going right – a really big thing: solar power, and wind, which now provide cheaper electricity than fossil fuels. Bill’s new book has the wonderful title “Here Comes the Sun” – he says solar is “A Last Chance for the Climate and a Fresh Chance for civilization.”

Also: Historian Eric Foner provides some historical perspective on what seems like the unique threat Trump poses to our freedoms. His new book, a collection of almost 60 essays, is titled “Our Fragile Freedoms.”

Plus: ‘Huckleberry Finn’ is America's great anti-slavery novel, but there's a secret behind it: Mark Twain, the author, wasn't always anti-slavery and anti-racist; in fact he fought, briefly, for the Confederacy. Adam Hochschild explains how Twain changed his mind.