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originally posted by: defcon5
originally posted by: Semicollegiate
How do you know that higher CO2 is going to do anything climatologically?
If nothing else can be proven, it can be proven that its leading to ocean acidification. That is killing off the corals, plankton, and other calcifying organisms that help sink the excess CO2. I believe that Venus is also frequently pointed to as a planet where we can observe runaway CO2 and greenhouse gasses.
All the AGW theory is possible, but none of it has been proven to be true, applicable, or sufficient effect.
The sun could attenuate the co2 by the radiational decomposition of CO2, hiding a natural CO2 spike. An extinct or non-detected micro organism could boost the CO2 like an epidemic, and then die, maybe as a regular effect of the Earth's natural rhythms.
How do you know?
As recently as 2007 scientists reasoned that CO2 concentrations could be safely allowed to reach 550 parts per million
Various proxy measurements have been used to attempt to determine atmospheric carbon dioxide concentrations millions of years in the past. These include boron and carbon isotope ratios in certain types of marine sediments, and the number of stomata observed on fossil plant leaves. While these measurements give much less precise estimates of carbon dioxide concentration than ice cores, there is evidence for very high CO
2 volume concentrations between 200 and 150 million years ago of over 3,000 ppm, and between 600 and 400 million years ago of over 6,000 ppm. In more recent times, atmospheric CO
2 concentration continued to fall after about 60 million years ago. About 34 million years ago, the time of the Eocene–Oligocene extinction event and when the Antarctic ice sheet started to take its current form, CO
2 is found to have been about 760 ppm, and there is geochemical evidence that concentrations were less than 300 ppm by about 20 million years ago. Carbon dioxide decrease, with a tipping point of 600 ppm, was the primary agent forcing Antarctic glaciation. Low CO
2 concentrations may have been the stimulus that favored the evolution of C4 plants, which increased greatly in abundance between 7 and 5 million years ago.
originally posted by: raymundoko
a reply to: applesthateatpeople
What about people in Georgia who are having cooler summers and colder/longer winters?