Billionaire Aubrey McClendon CEO of Chesapeake Energy, the nation's second-largest natural gas producer, is an evangelist for "fracking." Is the boom in natural gas a bubble that will go bust as the price of gas itself continues a dizzying fall?

Coltan ore is valuable as a source of niobium and tantalum, metals key to many kinds of electronics. Coltan mining has helped finance war in places like the Democratic Republic of Congo. Now new illegal coltan mining activity has sprung up in the remote Amazon jungles on the border between Venezuela and Columbia. It is controlled largely by armed militias and drug smugglers.

"When at least 80 tornadoes rampaged across the United States, from the Midwest to the Gulf of Mexico, last Friday, it was more than is typically observed during the entire month of March, tracking firm AccuWeather.com reported on Monday. According to some climate scientists, such earlier-than-normal outbreaks of tornadoes, which typically peak in the spring, will become the norm as the planet warms."

"President Barack Obama on Sunday told a pro-Israel lobbying group that 'loose talk of war' was only serving to benefit Iran because it was driving up the price of oil."

"Campbell's Soup has agreed to stop using the chemical BPA in the lining of its cans, joining a host of other brands moving away from using the substance."

"SAN FRANCISCO -- In 2005, the USS America aircraft carrier was towed out to sea on her final voyage. Hundreds of miles off the Atlantic coast, U.S. Navy personnel then blasted the 40-year-old warship with missiles and bombs until it sank."

"After one of the biggest environmental fights in decades, exploratory drilling is expected to begin in July off the state's north coast. The company has plans in case of a spill; opponents say normal operations will still release damaging chemicals."

"Every day, inspectors in white hats and coats take up positions at every one of the nation's slaughterhouses, eyeballing the hanging carcasses of cows and chickens as they shuttle past on elevated rails, looking for bruises, tumors and signs of contamination."