A record number of rhinos were poached this year in South Africa, home to the greatest number of the animals, as rising demand in Asia for their horns led to increased killings of the threatened species. At least 443 rhinos have been killed in South Africa in 2011, up from 333 last year, the national…

The idea of imposing a broad cap-and-trade system to cut America’s greenhouse gas emissions is dead and will be replaced with a new approach, an influential Republican senator said on Tuesday. Lindsey Graham, one of three senators working against daunting odds to produce a compromise climate bill, has recently turned against imposing the kind of…