chcr
Too cute for words
No they don't. They use 650,000 years of inferred extrapolation. Even then their error margins run in the tens of thousands of years. There are observations for around 1500 years, reliable ones for on the order of 200 years. In other words, they don't know what will really happen. Again, over the past 1.8 million or so years the earth has endured periods of intense glaciation and intergalcial periods, during some of which the polar ice caps may have disappeared completely. Now what makes more sense? That we are destroying the earth or that the earth's climate is continuing to change as it has in the past. One of those answers seems more than a little arrogant, doesn't it.spike said:That's why the scientists use 650,000 years of data. .
Here's a synopsis from a climatologist from Science magazine (that would be not part of the popular press)
ATMOSPHERE:
Ecological Versus Climatic Thresholds
Mark Maslin
How will the terrestrial vegetation respond to future climate change? In his Perspective, Maslin argues that studies of past climates can help to answer this question. He highlights the report by Jennerjahn et al., who show that ecological or vegetation responses to climatic changes may be delayed if an ecological threshold has to be crossed. In another study, Tzedakis et al. show that once such a threshold is crossed, the vegetation may not necessarily recover with a return to the original climatic conditions. Thus, both the time scale and the reversibility of future ecological changes as a result of global warming remain unclear.
Thus, both the time scale and the reversibility of future ecological changes as a result of global warming remain unclear.
Hey, believe what they tell you on the tee-vee. Most everyone else does so it must be true.