Science and technology

Associated Press
New York Mayor Michael R. Bloomberg, left, and Rio de Janeiro's Mayor Eduardo Paes gesture to construction workers as they visit the Chapeu Mangueira slum during the Rio+C40: Megacity Mayors Taking Action on Climate Change, a parallel event during the UN Conference on Sustainable Development, or Rio+20, in Rio de Janeiro, Brazil, Tuesday, June 19, 2012. While squabbling between rich and poor countries threatens to derail the Earth summit, the world’s mayors say they can’t afford the luxury of endless, fruitless negotiations and are already taking real action to stave off environmental disaster and preserve natural resources for future generations. (AP Photo/Felipe Dana)

View gallery

500 photos

Astronomy, meteorology, environment, archaeology, electronics, computers and gadgets

View Comments (0)