I’m not a scientist in this field, so I’m going to farm out a lot of the rebuttals:
- Much of the denialist information is based on a book by Ian Plimer, which is discussed here.
- Some of the questions come from Steve Fielding who is discussed here.
- A lot of the discussion is now around the fact that an economist at the EPA wrote a paper that isn’t being included in reports. That’s being discussed here (it’s suppression if an unsolicited report by a non-scientist isn’t included in scientific reports!).
Instead, I’m just going to include some graphs based on the data here.
The first shows the amount of CO2 in the atmosphere starting in 1880 (the numbers are in parts per million):
The second shows temperature above the average (where the base is average world temperature from 1961-1990–in hundredths of an absolute degree):
Wow, there does seem to be a relation doesn’t there. The temperature graph shows how much variation there is from year to year, but also shows the unmistakable trend (this is obvious from the line which is the ten year average–that’s why it starts in 1890). Notice that there is no trend down these last few years (this is true even if you look at a 3 year moving average).
The last graph looks at the relation between CO2 and temperature:
This last graph is discussed more fully here.