Climate change

This is from a recent news story on Yahoo! "If the world's nations act responsibly, Stern said, they will achieve "zero-carbon" electricity production and zero-carbon road transport by 2050 — by replacing coal power plants with wind, solar or other energy sources that emit no carbon dioxide, and fossil fuel-burning vehicles with cars running on electric or other "clean" energy. Then warming could be contained to a 2-degree-Celsius (3.4-degree-Fahrenheit) rise this century, he said. But if negotiators falter, if emissions reductions are not made soon and deep, the severe climate shifts and sea-level rises projected by scientists would be "disastrous." It would "transform where people can live," Stern said. "People would move on a massive scale. Hundreds of millions, probably billions of people would have to move if you talk about 4-, 5-, 6-degree increases" — 7 to 10 degrees Fahrenheit. And that would mean extended global conflict, "because there's no way the world can handle that kind of population move in the time period in which it would take place." Maybe we should have known this fifty years ago???