Quote:
Originally Posted by Der Fuhrer
Where are temperature readings taken? They're taken at weather stations in cities full of concrete that conducts heat. When studies are done to show that the Earth's average temperature has risen over time, they completely neglect to take any samples from Siberia, the largest and one of the coldest places on Earth.
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I can tell you this is at least partly wrong.
It is indeed true that cities are warmer than non-cities. And this is has been observed by a great many scientists. But I also know that historical readings of temperature do not come from what scientiest or people at the time recorded. There are many ways of finding out what conditions have been in history. One is to look at trees. When you cut down an old tree and look at its rings you can see how much rainfall there was for each year, etc. When you go to the antarctic and drill into the ice the ice has layers which tell you how much snowfall there was each year, and what the CO2 level at the time was. Likewise there are ways to say almost definititively what the temperature was for each year in the past, and these ways do not require human observation in cities. Scientists are so much more sophisticated than the global warming skeptics, the problem is they aren't paranoid and vocal.