The author and activist’s new book highlights that solar and wind has never been cheaper—and identifies the key hurdles to powering America with the sun. In his new book, Here Comes The Sun, author and activist Bill McKibben argues that we’re at a tipping point where solar and wind power is now cheaper to build and harness than fossil fuels. Because of that new economic reality, he argues renewable energy has the power to transform society—if only the U.S. government would listen.