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Carbon forcing has not been demonstrated to be a significant factor in atmospheric heat retention at levels below 2% (20,000 ppm, or 80 times current levels). The entire concept of CO2 being a factor in warming does not pass planetary modeling tests. The example given of Venus ignores the fact that Venus atmosphere is over 95% CO2. That's almost 2500 TIMES the concentration found in Earth's atmosphere. And try not to forget, as most AGW alarmists do when using Venus as an example of what CO2 can do to runaway green house effect, that Venus receives almost 30% greater solar flux than the Earth does.
Additionally, in ALL studies done on the correlation between CO2 concentrations and mean global temperatures derived from ice core samples, CO2 concentrations rise AFTER a temperature spike, not before. But AGW alarmists not only treat the described correlation as a cause-effect relationship (which is a gross misuse of statistical analysis), but a relationship the reverse of what the data shows. They claim CO2 causes warming when the data shows warming causes a release of CO2, increasing the atmospheric concentrations. They have no actual data, just conjecture, that the released CO2 in turn causes additional warming.
One other point: the correlation between CO2 and mean global temps follows a pattern for the 600,000 years of ice core samples, but when temperature and atmospheric data is extrapolated from earlier periods, the correlation falls apart completely. From the mid Jurassic period until present day, CO2 concentrations have been in a general decline from 2700 ppmv to today's 387 ppmv. Yet from end of the Jurassic Period through the first third of the Cretaceous Period the Earth warmed from a mean temperature of 15° to a mean of 22°, stayed that way through the first third of the Tertiary Period, then declined to today's 13° mean temperature. Further, at the end of the Ordovician Period the Earth's mean temperature drops dramatically from 23° to 12° while CO2 rises from 4000 ppmv to 4500 ppmv, then temperatures rise again to 20° while CO2 drops from 4500 ppmv to 3000 ppmv. In short, the correlation between CO2 and temperature DOES NOT EXIST except in the brief period of recent geologic history.
Between the facts that the recent correlation found in ice core data falls apart in earlier times, and the fact that correlation does NOT indicate cause/effect, and the fact that all studies of recent patterns indicate CO2 increases following rather than leading temperature increases all blend into the conclusion that AGW claims that human sources of CO2 added to the atmosphere are contributing to climate change is so much unsupported hogwash.
Additionally, in ALL studies done on the correlation between CO2 concentrations and mean global temperatures derived from ice core samples, CO2 concentrations rise AFTER a temperature spike, not before. But AGW alarmists not only treat the described correlation as a cause-effect relationship (which is a gross misuse of statistical analysis), but a relationship the reverse of what the data shows. They claim CO2 causes warming when the data shows warming causes a release of CO2, increasing the atmospheric concentrations. They have no actual data, just conjecture, that the released CO2 in turn causes additional warming.
One other point: the correlation between CO2 and mean global temps follows a pattern for the 600,000 years of ice core samples, but when temperature and atmospheric data is extrapolated from earlier periods, the correlation falls apart completely. From the mid Jurassic period until present day, CO2 concentrations have been in a general decline from 2700 ppmv to today's 387 ppmv. Yet from end of the Jurassic Period through the first third of the Cretaceous Period the Earth warmed from a mean temperature of 15° to a mean of 22°, stayed that way through the first third of the Tertiary Period, then declined to today's 13° mean temperature. Further, at the end of the Ordovician Period the Earth's mean temperature drops dramatically from 23° to 12° while CO2 rises from 4000 ppmv to 4500 ppmv, then temperatures rise again to 20° while CO2 drops from 4500 ppmv to 3000 ppmv. In short, the correlation between CO2 and temperature DOES NOT EXIST except in the brief period of recent geologic history.
Between the facts that the recent correlation found in ice core data falls apart in earlier times, and the fact that correlation does NOT indicate cause/effect, and the fact that all studies of recent patterns indicate CO2 increases following rather than leading temperature increases all blend into the conclusion that AGW claims that human sources of CO2 added to the atmosphere are contributing to climate change is so much unsupported hogwash.
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