First Tunguska Meteorite Fragments Discovered | MIT Technology Review.

BBC News – Toba super-volcano catastrophe idea 'dismissed'.

All Eyes on Keeling Curve: Scientists Anxious as CO2 Levels to Cross 400 PPM | InsideClimate News.

Researchers find high-fructose corn syrup may be tied to worldwide collapse of bee colonies.

Sea surface temperatures reach highest level in 150 years.

BBC News – LED streetlamp aims to improve public's view of stars.

China trounces U.S. in green energy investments – Apr. 17, 2013.

Antarctic ice sheet melt 'not that unusual', latest ice core shows • The Register.

Sweden runs out of garbage, forced to import from Norway | MNN – Mother Nature Network.

Arctic Summer Ice Melting Faster Than Previously Thought, Scientists : Nature & Environment : Science World Report.