Two bullet trains collided in China killing 43, injuring 211, on Saturday evening, July 23 in Wenzhou city, after one train stalled on a viaduct, causing four cars of the moving train to fall up to 100 ft. to the ground below. Video attached.
Jul 26, 2011   AP via USA TODAY
While carbon dioxide has received the most attention as the primary greenhouse gas, methane, while less prevalent, is far more powerful in its ability to retain heat. The melting permafrost in Siberia represents a major source of methane emissions.
Sep 17, 2006   AP via USA TODAY