@carpenter: there have been well documented increases in the global average temp in the 2000s. I don't know what your national media said.... but i recall something along the lines of 7/8 of the highest recorded temperatures in the past 10 years.
The question of whether CO2 levels and global average temperature are linked is a good one.
It is possible that in the past CO2 levels lagged behind temperature (so there would be a correlated rise but the temperature would rise first) - i don't know i'm just speculating here - which would mean that in the past when temperature rose 'natural' mechanisms, such as the ocean's capacity to hold CO2 and permafrost melting/releases, caused a CO2 rise.
However this doesn't mean it is impossible to trigger a temperature rise via CO2 emissions (and that temperature rise will in turn trigger a positive feedback loop, releasing more CO2 and increasing the temperature even more)
"global warming...is backed up by a lot of scientists (not all of them experts)"
But it is the best theory backed by ALL the experts. That is, while some non-experts also back the theory, those who are considered experts almost to a man back the theory.
As for models, well i'm sure you can come up with 1,000s of different models, and various climate scientists have indeed done that, but while they all disagree on the amount of warming, none of them suggest increased CO2 levels will correspond to lower global temperatures.
There is certainly a lot of picking and choosing of models to fit the past data best, but they are always trying to best include new phenomena or better model them... if a model happens to correspond to the past data but doesn't include as many features then it may