Could encouraging more private investments in solar power and other forms of clean energy help make renewable forms of energy more popular in America - and lead to the downfall of dirty fossil fuels? That and more in our Conversations with Great Minds with Billy Parish. Billy is the co-founder and president of Mosaic - a solar power investment platform. In 2002 - Billy dropped out of Yale University to help found the Energy Action Coalition - which quickly grew into the largest youth advocacy organization in the world working on the climate change crisis. He's been honored by Rolling Stone magazine as a "Climate Hero," and by the Utne Reader as one of the "50 Visionaries Who Are Changing Your World." Billy is also the co-author of the book, "Making Good: Finding Meaning, Money and Community in a Changing World."