I looked into that warming thing a while ago. The temperatures are measured in weather stations. A good few of them are located in built up areas that heat up to higher temperatures due to house heating, cars and industry than the surrounding areas. Therefore the measured temperatures there are corrected before they go into the average temperature calculations. Some scientists say that those corrections are not high enough.
I think this is very unscientific (is there such word?) approach. You cannot manipulate your raw data before you use it.
I checked with the DWD (German weather service) and indeed about 75% of the weather data recording stations are in densely populated areas.
I read about that in a book displaying long term (100-150 years back) temperature measurements in rural America that clearly showed a cooling down tendency. Unfortunately I was not able to find those measurements any more on appropriate web sites.
So to say it in short: I have very serious doubts about that whole warming subject.
And climate has always changed in the past, long before humans were on the planet, and climate will always change in the future when humans have long eradicated themselves.
