September 21, 2012 An ancient beauty in southwestern Colorado, Chimney Rock became the third national monument named by President Obama on Friday. More than just a spectacular feature, Chimney Rock's towering sandstone pillars were of astronomical importance to the ancestral Pueblo people over 1,000 years ago.
September 6, 2012 As climate change brings more drought and flooding, food prices are expected to keep spiking. Such spikes affect the poor the most, but especially the poor in Africa and the Middle East, says a new Oxfam report.
August 16, 2012 What could be worse than a ruptured pipeline of crude oil? A ruptured pipeline of tar sands oil — a thick, sticky substance. Cleanup of a 2010 spill in Michigan's Kalamazoo River took much longer and was far harder than anyone had anticipated. It's now a cautionary tale for people in the middle of the new Keystone pipeline's path.
August 15, 2012 South America's Chinchorro people lived in an extremely dry desert region where the dead turned into mummies naturally. But at some point, they stopped leaving the process to nature. Now, scientists say the Chinchorros began mummifying their dead as their climate grew wetter.
July 10, 2012 More than 800,000 gallons of crude oil gushed into wetlands and a creek in western Michigan in 2010 after a pipeline operated by the Canadian company Enbridge burst. Now, the National Transportation Safety Board says the company and the agency that regulates it are culpable.
May 17, 2012 Four years ago, an atmospheric scientist near Boulder, Colo., stumbled on surprising air pollution data: The region's levels of methane, a powerful greenhouse gas, were far higher than anyone would have expected. What was going on? The search for an answer led straight to the natural gas and oil fields of northern Colorado.
May 15, 2012 Hundreds of thousands of natural gas wells have sprung up across the country. In Garfield County, Colo., the drilling rigs are so close to homes that some people call them "Close Encounters." When the gas boom began a decade ago, residents began asking: Is it safe to live this close? Their quest for answers became too polarizing to pursue.