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Global warming my ass!
"Ryan P." wrote in message ... ecarecar wrote: Ryan P. wrote: ecarecar wrote: Before you relax in you complacency, I think you should check on the rate of change during the "vast number of major changes in Earth's past history." I think you will find that never before has the rate of change been this large. . . Okay, I did a bit of research. It seems that just after the end of the last major ice age, 12,000 years ago (before modern civilzation), the global temperature jumped by about 14 degrees (F) in just a few decades. This article: http://www.spacedaily.com/news/climate-04k.html Cites several other examples of rapid climate change. Two particularly interesting paragraphs: ""Technically, an abrupt climate change occurs when the climate system is forced to cross some threshold, triggering a transition to a new state at a rate determined by the climate system itself and faSter than the cause," according to a definition developed by the National Research Council. Abrupt change needs a trigger, an amplifier -- some mechanism to have the trigger affect a large area -- and a source of persistence. It turns out lots of triggers have been identified, for example, an accumulation of carbon dioxide in the atmosphere, as is occurring now."" If someone claims that there was a temperature increase of "14 degrees (F) in just a few decades" some time in the past, they certainly can't claim it was caused by loading the atmosphere with carbon dioxide in just a few decades. It is not comparable. . . Speaking of which, there's disagreement on whether an increase in CO2 leads to an increase in temperature, or if an increase in temperature leads to an increase in CO2. Ice core samples and other evidence suggest that the planet warmed first, and then experienced an increase in CO2 levels. Which in no way discounts the effects of CO2 on the climate. |
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