Just how power hungry is internet giant Google? The Takeaway's Power Trip heads to the Google campuses in Mountain View, California to find out. John Hockenberry sits down with Bill Weihl, the company's green energy czar (that's his title, no joke). On the interview agenda: the company's top picks for which alt-energy sources will rule the future clean energy economy, including solar with a twist. Plus, Weihl talks about the need for government energy subsidies, and why the company still ain't talking about the power consumed by a Google search.