Does anyone know how these averages are calculated? Is it a straight average of the temperature of each square mile of the entire globe, or are there weights for regions or terrain types?
The grids for the northern and southern hemisphere are averaged separately and then combined with a weight to eliminate bias towards the northern hemisphere (since most of the weather stations are concentrated in the northern half of the planet).
There are lots of different models for this calculation and different agencies use ones tailored to their needs and data quality.
This would then apply that it's not "global warming" but merely the effect of concrete heat capture and emission and not CO2 related?
How can they then say this is "human gas pollution related"?
Where am I wrong (serious question)?