Monday, December 12, 2005

Proof of global warming

The Economist describes scientific arguments that confirm the trend of global warming:
The first, and most basic, is the continuation of the warming trend at the Earth’s surface that has been happening since the early 20th century... the ten years to 2004 were the warmest decade since reliable measurements began in the early 19th century.

The second result is that the Arctic, a place where any warming trend would be amplified by changes in local absorption of heat as the ice melts, does, indeed, show signs of rapid warming.

...a disagreement between the temperature trend on the ground, which appeared to be rising, and that further up in the atmosphere, which did not. Now, both are known to be rising in parallel.

...the way the world’s oceans have warmed up at different depths... match climate models’ predictions of what happens when warming is induced by greenhouse gases better than it matches predictions of the result of changes in the sun’s activity.

The fifth is the observation in reality of a predicted link between increased sea-surface temperatures and the frequency of the most intense categories of hurricane, typhoon and tropical storm. observation that ocean currents in the North Atlantic are faltering in ways that computer models of the climate previously suggested would happen in response to increased temperatures.
Meanwhile, as the rest of the world attempts to battle this menace, the most polluting nation stays aloof.