E.g., http://www.fhwa.dot.gov/environment/climate_change/adaptation/workshops_and_peer_exchanges/albany_09_2008/gccalbany.cfm http://www.fhwa.dot.gov/environmen

E.g., http://www.fhwa.dot.gov/environment/climate_change/adaptation/workshops_and_peer_exchanges/albany_09_2008/gccalbany.cfm http://www.fhwa.dot.gov/environment/climate_change/adaptatio... Of course we aren't 100% sure. Some of the dire predictions may not come true. Some may be worse. But we have some idea what will happen to various parts of the world when the temperature hits +2.0C, +3.0C, and so on, and it ain't pretty.