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A California utility is aggressively developing power sources cleaner than coal -- natural gas, nuclear, hydro, wind, solar ... and now even cow manure. But Pacific Gas & Electric isn't turning green totally on its own. It's the law. Sarah Gardner reports.
Even if we develop all the renewable energy we need, Earth will still warm more than it has in the history of mankind. Sam Eaton and Sarah Gardner look at how governments and businesses are planning to adapt to radical changes in our environment.
If global warming's worst effects are to be averted, new energy sources must be developed on a massive scale. But there will be winners and losers in that process. Sarah Gardner and Sam Eaton take us to two locales with stakes in America's energy future.