bayGIANTS said:
how the hell do you know this, it could decrease in a hundred years just as easily and we will be back to where we all started
Well, we know that the temperature has risen 1 degree in the last 1 hundred years because the balance of scientific evidence suggests that our use of coal, oil and natural gas for energy has had a direct impact on the world's climate. The concentration of carbon dioxide (a key greenhouse gas) has increased 35 percent in the atmosphere since industrialization.
Climate increase of around 4 to 5 degrees can be devastating. A basic understanding in Science is very important comrade.
Climate change will directly effect many species; when the ocean temperatures in the North Pacific rose 6 degrees Centigrade above normal in 1997, local salmon populations crashed.
-Coral reefs around the world have been severely damaged by bleaching induced by warmer ocean temperatures. During bleaching, corals lose their symbiotic algae, and coral death can follow soon after. 1998 saw the highest incidence of coral bleaching on record. (For further information, visit WWF).
-Loss of wetlands
-A sea level of one metre would threaten half the world's coastal wetlands of international biodiversity importance.
-A 3-4 degree C warming could destroy up to 85 per cent of the remaining wetlands in semi-arid southern Europe.
-Under global warming forests will move north, displacing the Arctic tundra, which is the breeding area for millions of Arctic water birds. A 40 per cent loss of tundra would mean that 4 to 5 million geese and about 7.5 million Calidrid waders could lose their habitat. The worst affected birds are likely to be the already critically endangered Red Breasted Goose, the Tundra Bean Goose, the Spoon-Billed Sandpiper, and the Emperor Goose.
-Even with a mild global increase in temperature of 1.7 degree C, these birds would lose more than 50 per cent of their habitat. A more radical warming of 5 degree C would destroy 99 per cent of the habitat of the Red Breasted Goose.
-To cope with a warming of 2 degrees C over a century, species at mid-latitudes would have to shift about 400 km towards the poles, or climb about 400m uphill. Such migration rates are difficult to achieve.
-Trees with wind-born seeds can move at most 100-200 km a century, but most deciduous species such as walnut, chestnut and oak can move only 10-15 km a century.
-Global warming has already caused probable extinctions. The only known population of golden toad (Bufo periglenes), discovered in the Monteverde cloud forest, of Costa Rica, has have not been seen since 1986-87 after very low rainfall and high temperatures during an El Niño event. Some 20 out of 50 amphibian species went locally extinct at around the same time.