A forest near Trieste, Italy, is largely dead owing to drought stress during the summer of 2012. Andrea Nardini/Nature hide caption

itoggle caption Andrea Nardini/Nature

Energy Of The Future? California company Sierra Energy is testing out a reactor that turns garbage — like these wood chips, metal fragments and plastics — into synthetic gas that can then be turned into a low-carbon diesel fuel. Christopher Joyce/NPR hide caption

itoggle caption Christopher Joyce/NPR

California begins a new plan to ration greenhouse gas emissions from large companies on Wednesday. Big companies must limit the greenhouse gases they emit and get permits for those emissions. Above, the Department of Water and Power San Fernando Valley Generating Station, in Sun Valley, Calif., in 2008. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

Consolidated Edison workers try to repair damage near the New York Stock Exchange on Tuesday. Bloomberg via Getty Images hide caption

itoggle caption Bloomberg via Getty Images

This artistic interpretation shows an adult and juvenile feathered ornithomimid dinosaurs. Julius Csotonyi/Science hide caption

itoggle caption Julius Csotonyi/Science

Actors Stan Laurel and Edna Marlon play at socializing around the campfire. It turns out that early man's brain developed in part thanks to cooking. Hulton Archive/Getty hide caption

itoggle caption Hulton Archive/Getty

This image, from an archival video, shows the white whale NOC swimming around and under researchers' boats. Current Biology hide caption

itoggle caption Current Biology

A fragment of the meteor that crashed into Tissint, Morocco. Mark Mauthner/Heritage Auctions hide caption

itoggle caption Mark Mauthner/Heritage Auctions

Invasive brown tree snakes have gobbled up most of Guam's native forest birds. Without these avian predators to keep their numbers in check, the island's spider population has exploded. Isaac Chellman/Rice University hide caption

itoggle caption Isaac Chellman/Rice University

An artist's re-creation of the first human migration to North America from across the Bering Sea. DEA Picture Library/De Agostini/Getty Images hide caption

itoggle caption DEA Picture Library/De Agostini/Getty Images

The shiny blue berries of the tropical Pollia condensata plant rely on their looks, not nutritional content, to attract birds to spread their seeds. Silvia Vignolini et al. via PNAS hide caption

itoggle caption Silvia Vignolini et al. via PNAS