Some know the inadequacies of the world temperature data. Few know the degree of manipulation and corruption of the data done to prove the 20th Century temperature increase was unnatural. It completely undermines the scientific claims of the Intergovernmental Panel on Climate Change (IPCC).
There are serious problems with all the current measurements from surface stations to satellites, but a major one is the contamination of the surface readings by changes in the physical conditions around the weather station. This article looks at one contentious issue and serious concern with the surface record known as the Urban Heat Island Effect (UHIE).