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"The world's air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant.

Monitoring stations across the Arctic this spring are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere. The number isn't quite a surprise, because it's been rising at an accelerating pace. Years ago, it passed the 350 ppm mark that many scientists say is the highest safe level for carbon dioxide. It now stands globally at 395.

"Nothing says 'lunch time' to an American kid quite like a peanut butter and jelly sandwich. Slices of deli meat might be a close second. Unbeknownst to most parents who pack school lunch boxes, however, both of these favorites could expose kids to toxic chemicals. In a new study of popular products purchased from grocery stores in Dallas, Texas, researchers found that nearly half of the sampled peanut butter and cold cuts, as well as turkey, fish, beef and other fatty foods, contained traces of a flame retardant commonly used in the foam insulation of building walls."

"Refugee workers in the Sahel region where thousands of Malian refugees are fleeing violence in their country said this week they are witnessing firsthand the knotted challenges of food security, climate change and conflict in Africa."

"KANSAS CITY, Mo. -- Cattle farmers complained on Wednesday that a federal agency is 'spying' on their operations by flying airplanes over Midwest cattle feedlots to see if they are complying with clean water regulations."

A 23-year-old battle over construction of a nuclear power plant in India's southern state Tamil Nadu seems to be coming to a climax -- as politicians shift sides, protesters go on hunger strikes, and the political fallout from Fukishima settles.

"The head of the National Weather Service retired last week after an internal investigation found that the agency had reallocated millions of dollars without required congressional approval."

"The food industry likes to portray obesity as a matter of personal responsibility: People who eat too much gain weight, and it's their own fault."

"Spain's Repsol oil company announced Tuesday it was 'almost certain' to withdraw from exploration in Cuba, after spending an estimated $150 million on a dry well and seeing far more profitable prospects in other countries such as Brazil and Angola."

"TEHRAN, Iran - Computer technicians battling to contain a complex virus last month resorted to the ultimate firewall measures - cutting off Internet links to Iran's Oil Ministry, rigs, and the hub for nearly all the country's crude exports."

"The answer to this question is unknown. What is known is that the U.S. government's flood insurance program has paid the First Apostolic Church of Rio Linda for six damage claims and will probably be on the hook again when another flood crests, which could be pretty soon."