News bites: ExxonMobil chief talks climate, fracking, Keystone

A team of researchers studying temperatures since the last ice age ended 11,000 years ago says the current rates of global warming are unprecedented, NPR reports.

China is poised to become the world's largest solar power market this year, according to Bloomberg.

Bloomberg Businessweek explains the recent spike in U.S. oil imports.

More in E2-Wire

Grueling Keystone fight to hit new Senate

Read more »