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By Tom Miles GENEVA (Reuters) - Biodiversity has decreased by an average of 28 percent globally since 1970 and the world would have to be 50 percent bigger to have enough land and forests to provide for current levels of consumption and carbon emissions, conservation group WWF said on Tuesday. Unless the world addresses the problem, by 2030 even two planet Earths would not be enough to sustain human activity, WWF said, launching its "Living Planet Report 2012", a biennial audit of the world's environment and biodiversity - the number of plant and animal species. Yet governments are not on track to reach an agreement at next month's sustainable development summit in Rio de Janeiro, WWF International's director general Jim Leape said

Only 38 percent of the 16 million American women aged 15 to 25 who are sexually active were screened for chlamydia in the prior year, putting them at risk for chronic pain, life-threatening pregnancies and infertility, U.S.

PARIS (Reuters) - U.S. biotech firm Monsanto said on Tuesday it does not plan to sell its genetically modified maize MON810 in France this year, nor after, even though the country's highest court overturned a 3-year ban in November. "Monsanto considers that favorable conditions for the sale of the MON810 in France in 2012 and beyond are not in place," the company said in a statement, adding that it had told the French authorities about its intentions.

A ballot initiative requiring Los Angeles porn actors to wear condoms has qualified to go before city voters in a presidential primary election in June, organizers said on Tuesday.

By Jeff Mason and Matt Spetalnick WASHINGTON (Reuters) - President Barack Obama said on Tuesday health and economic factors would be taken into account when he decides whether to approve TransCanada Corp's Canada-to-Texas Keystone XL pipeline proposal.

By Risa Maeda TOKYO (Reuters) - Japanese utilities will largely avoid power shortages this winter despite prolonged reactor shutdowns amid public concerns over nuclear safety, but hurdles remain for next summer, the government said on Tuesday. [More]

By Andrew Stern CHICAGO (Reuters) - Great Lakes shorelines are becoming clogged by algae blooms fed by agricultural run-off, while invasive mussels decimate the food chain in deeper waters, an environmental group said on Tuesday. [More]

By Christine Stebbins CHICAGO (Reuters) - Rich countries grabbing farmland in Africa to feed their growing populations can leave rural populations there without land or jobs and make the continent's hunger problem more severe, an environmental think tank said on Tuesday. [More]

By Jessica Dye NEW YORK (Reuters) - Federal officials seized roughly a ton of ivory in one of the largest U.S. seizures on record and arrested the owner of an African art store accused of smuggling carved elephant tusks into the United States, authorities said on Tuesday

By Malathi Nayak WASHINGTON (Reuters) - The Energy Department said on Tuesday it would install 18 fuel cell backup power systems at eight U.S. military posts, as part of a partnership with the Defense Department to bolster energy security.

By Deborah Zabarenko, Environment Correspondent WASHINGTON (Reuters) - An iconic species of the American West, the whitebark pine, is at risk of extinction from climate change and disease, the U.S. Fish and Wildlife Service said on Tuesday, but no immediate action is planned.

By Robert Evans GENEVA (Reuters) - A solid shift to green technologies in world farming is vital if endemic food crises are to be overcome and production boosted to support the global population, the United Nations said on Tuesday. [More]

GENEVA (Reuters) - The worst drought in 60 years in the Horn of Africa has sparked a severe food crisis and high malnutrition rates, with parts of Kenya and Somalia experiencing pre-famine conditions, the United Nations said on Tuesday.

GENEVA (Reuters) - The worst drought in 60 years in the Horn of Africa has sparked a severe food crisis and high malnutrition rates, with parts of Kenya and Somalia experiencing pre-famine conditions, the United Nations said on Tuesday. More than 10 million people are now affected in drought-stricken areas of Djibouti, Ethiopia, Kenya, Somalia and Uganda and the situation is deteriorating, it said. [More]

By Alister Doyle, Environment Correspondent BONN (Reuters) - Tighter limits on soot and smog provide a quick and easy way to fight global warming while protecting human health and raising crop output, a U.N. study said on Tuesday. [More]