How not to measure temperature, part 68 at Watts Up With That? shows a ground station... surrounded by parking lots and roads, and within a few dozen yards of the college power plant.
How reliable is the data? How much of an effect do the roads and parking lots (and cars) and such have on the record from this station?
The data used by the AGW folk come from ground stations like these - they're 1 of the 4 methods of gathering earth and air temperatures... and the only one showing global warming.
Can't imagine why that would be... can you?
J.