Quote:
Originally Posted by Waxing_Gibbous
All this CO2 we and our volcanoes are busy pumping into the air isn't just sittting there, it's being absorbed and re-used and really hasn't made any appreciable impact on the actual percentage of CO2 in our atmosphere (0.04%?).
There was far more, back when you had to fight a T-Rex to get to the office and Life was positively everywhere.
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In some 100 years we have managed to increase the CO2 content from the pre-industrial level of around 270ppm to now close to 400ppm. That's almost a 50% increase, in a very short time.
The whole problem of AGW lies in the fact that such large and fast variations will
most likely result in equally fast and large changes in habitability of the Earth's various regions. Yes there was more CO2 in the atmosphere millions of years ago, but those changes were due to imbalances that happened over very long geological time scales, and thus ecosystems had plenty of time to adapt.
The world won't come to an end just because the CO2 content of the atmosphere rises, but with the
speed that it is happening now it will probably have very dramatic negative consequences for us humans. We may then be longing back to the days of the early 21st century where we only had to worry about a small global financial crisis
...oh well, that's how it goes I guess 
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