WGBH’s Kara Miller moderated a panel with professors Jessika Trancik and Richard Lester of MIT and Kelly Sims Gallagher of Tufts University on powering the world with clean energy. The event was part of the Solve Talks at Google series, which emerged from MIT’s inaugural Solve event last fall. Panelists discussed technological advancements in the clean energy sector, as well as the political, economic, and social barriers to adopting green technology.