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Southern butterflies shifting to warmer north Video: Warm climate butterflies are spending more and more time in Massachusetts.	Sheryl Crow suspects cellphone caused tumor Video: Singer Sheryl Crow says spending time on an older cellphone may have caused her brain tumor. A doctor weighs in.	9/11 1st responders get cancer coverage Video: 58 types of cancer were added to the list of covered illnesses for people exposed to toxins at ground zero.
Pungent rotten egg stench in California due to fish? Video: Public officials in southern California are searching for the source of a stench that has permeated the region. One theory is that the odor from a massive fish die-off in the Salton Sea, a lake about 75 miles west of San Diego, was blown to th	For these party animals, it's all happening at the zoo Video: Zoos from San Francisco to London are pulling in visitors by offering the 'silent disco.' Zoo-goers jam to their favorite beats while wearing headphones, and preserve the natural sleep patterns of the zoo animals.	Farm powered by walnuts Video: A walnut farmer in California uses walnut shells and husk waste to create fuel to power his farm.
Will Google Fiber impact Kansas City property values? Katie Yeager answers questions from an NBC affiliate about whether or not Google Fiber will increase property values in Kansas City, Kan., and Kansas City, Mo.	Play with kittens from your computer Video: The Best Friends Animal Society has doubled its cat adoptions after setting up an interactive cat webcam and playroom.	New York law poised to increase number of organ donors Video: The State of New York has ranked second to last in donor registrations – unsettling for those 10,000 New Yorkers on an organ donor list. But a transplant law inspired by a 12-year-old girl could change that.

Assignment Earth: Trackways National Monument Video: In a national monument that is still wild and undeveloped, fossilized animal tracks date back three hundred million years.	Man and croc become BFFs Video: It's said that dog is man's best friend, but one man in Costa Rica is bucking the trend. Chito, a 52-year-old fisherman, and his crocodile Pocho have hardly spent a day apart in 20 years.	Press conference: UFO's eyeing our nuclear weapons? Video: Former U.S. Air Force personnel claim they experienced UFO activity near nuclear sites at which they worked.
Think bedbugs are bad? Meet the stink bugs Video: States across the nation are being plagued by smelly stink bugs. The pungent pests have been spotted as far west as California and as far south as Florida.	India's toxic ritual Video: Environmentalists say an Indian ritual leads to toxic water and dead fish.	Finding hidden oil and gas plumes in the Gulf Video: Below the surface, thousands of marine creatures are still in danger from the Gulf oil disaster.
Going green with goats in Detroit Video: A Detroit charter school borrows a herd of goats to clear lot for a class garden.	Bedbug summit to be held in Chicago Video: Experts in both medicine and extermination are meeting in the Windy City to plot a solution to the infestation epidemic plaguing many cities across the U.S.	Death of a river: The Colorado River Delta Video: Alexandra Cousteau and Expedition Blue Planet follow Colorado's dry riverbed to its historic mouth in the Upper Gulf of California.

Ecollywood: Josh Dorfman Video: Josh Dorfman, The Lazy Environmentalist talks about his television show.	The Green Party: Behind the scenes at a letterpress shop Video: See what goes on behind the scenes at a letterpress printing shop in Brooklyn.	Ecollywood: Alice Greczyn and Jim Parsons Video: Get green tips from Alice Greczyn and Jim Parsons.
ON THE STREETS: A green photoshoot Go behind-the-scenes, and see what happens during Kesselman's promotional photoshoot at Columbus Circle.	Assignment Earth: Ecoventure Certified "green tourism" protects natural and cultural resources and pays fair wages to workers in Guatemala	Ecollywood: Freddy Rodriguez and Mandisa Video: Get this week's eco-tips from Freddy Rodriguez and Mandisa.
WONDERS OF THE WORLD CONCERT: Red Poppies performs Red Poppies gives an amazing drum performance	WONDERS OF THE WORLD CONCERT: Sylvia Tosun performs 'Jasmine Flower' Sylvia Tosun performs 'Jasmine Flower'	WONDERS OF THE WORLD CONCERT: Doyle Bramhall II performs 'I'm Leavin' Doyle Bramhall II performs 'I'm Leavin'