British business mogul Richard Branson today pledged $3 billion to combat global warming over the next decade: 100% of the profits from Virgin's transportation and airline sectors. But there might be motive besides saving the planet, Sam Eaton reports.
Xcel Energy plans to build a clean-coal power plant to capture its CO2 emissions. It's hailed as a breakthrough in addressing global warming — but Colorado ratepayers may be stuck with a billion dollar bill. Sam Eaton looks at clean energy's next big hurdle: the tab.