sigh
What I find interesting about all this is that although the IPCC reports that we are 'most likely' causing climate change, the numbers they give in the report show the opposite.
They say that they have concluded that the net effect of human activities since 1750 is an increase of radiative forcing of 1.6 (-0.6 +2.4) W/sq m. However what they don't mention anywhere is that the normal radiation is between 200 and 400 W/sq m - ie the total effect of man since 1750 is less than 1% of the solar radiation - and this small amount is somehow supposed to be significant!