The company has spent $4 billion since 2007 on preparations to explore for oil off the north coast of Alaska. Many Alaskans welcome the venture, which could lead to the development of trillions of dollars worth of oil. But not everyone's convinced Shell has all the environmental protections in place to protect areas of the pristine Arctic.
Western U.S. beaches are getting a regular dose of debris from the 2011 tsunami in Japan. The first few items were curiosities — a boat here, a soccer ball there. But as the litter accumulates, so does the unprecedented threat of biological invasion.
Consumers get agitated when they see apples, celery and red peppers singled out for containing the most pesticide residue. Scientists say it's not such a big deal because the pesticide levels are extremely low.
U.N. Secretary-General Ban Ki-moon wants to kick-start a big initiative to double the share of renewable energy worldwide, make sure everyone on the planet has power, and cut in half the amount of wasted energy. But critics say the agenda in Rio is so bloated that it's unclear what can be accomplished.
Ash and charred debris from the largest wildfire in New Mexico's history are threatening the survival of the Gila trout. Biologists are trying to save the fish by using electroshock to temporarily stun the trout and re-locate it to a hatchery. The trout is an endangered species that can be found only in four streams within the Gila Wilderness. Melissa Blocks talks to Jim Brooks, Project Leader of the New Mexico Fish and Wildlife Conservation Office, about his team's efforts to save the trout.
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