Katie Couric on Primary Questions asked ten leading presidential candidates whether or not global warming is a real and immediate threat.
Climate obviously has changed and will continue to change. The observation that ice is melting, which can look dramatic on TV, does not show that human activity is the cause. The assertion that humans are or ever can have a significant influence on climate by limiting the use of fossil fuel (a.k.a. limiting human production of carbon dioxide) is not supported by any historical record. The only implication that carbon dioxide level has a significant effect on climate comes from huge but still incomplete computer programs that attempt to predict future climate.
Avoid the group-think and de facto censorship by Climate Scientists. Directly interrogate official government data from ORNL and NOAA as follows:
If the carbon dioxide level from Law Dome, Antarctica http://cdiac.ornl.gov/ftp/trends/co2/lawdome.combined.dat is graphed on the same time scale as fossil fuel usage from http://cdiac.ornl.gov/trends/emis/tre_glob.htm it is discovered that the current carbon dioxide level increase started about 1750, a century before any significant fossil fuel use.
If average earth temperature since 1880 from http://www.ncdc.noaa.gov/oa/climate/research/anomalies/anomalies.html is graphed on the same time scale as fossil fuel use it is discovered that there is no correlation between rising fossil fuel use and average global temperature at least until 1976.
The asserted hypothesis that, since 1976, increasing carbon dioxide level has caused the temperature to rise is refuted by the carbon dioxide level from http://cdiac.ornl.gov/trends/co2/vostok.html and temperature from http://cdiac.ornl.gov/ftp/trends/temp/vostok/vostok.1999.temp.dat determined from the Vostok, Antarctica ice cores. If these are graphed on a higher resolution time scale it is discovered that the change in atmospheric carbon dioxide level lags earth temperature change by hundreds of years.
If Law Dome and recent carbon dioxide data and Vostok and recent temperature are plotted on the same graph since 1000 AD (or before) it is observed that temperature oscillates up to plus or minus 1.5 degrees Celsius (half pitch about 100 yr) while carbon dioxide level remains essentially unchanged (between 9000BC and 1750AD). This will also show that the average global temperature 200 years ago was about the same as now, 400 years ago was significantly higher than now and current rate of temperature change is fairly typical. Recent measurements show that average earth temperatures in 2006 and 2007 were actually lower than in 1998.
For most of the history of earth, as shown at http://www.geocraft.com/WVFossils/Reference_Docs/Geocarb_III-Berner.pdf , carbon dioxide level has been several times higher than it is at the present.
The conclusion from all this is that carbon dioxide change does not cause significant climate change. Actions based on the human-caused global warming mistake put freedom and prosperity at risk.
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