Many climate scientists, such as James Hansen of NASA's Goddard Institute, believe that any sustained period of time with higher than 350 ppm threatens catastrophic global warming.
Thousands of demonstrations will call out Monsanto for its seed monopoly, genetic modification of organisms, and court-sanctioned silencing of dissent.
Wisconsin, on May 14, saw its largest wildfire since 1980. Meanwhile, in California, another fire that began May 15 has blackened 3,800 acres.
Students and concerned citizens from a variety of organizations held a protest at a conference of the Institute for Clean and Secure Energy. The institute promotes use of tar sands, oil shale and coal.
Any day now, billions of cicadas with bulging red eyes will crawl out of the earth after 17 years underground and overrun the East Coast.
According to the International Union for Conservation of Nature, Africa's western black rhino is now officially extinct.