Read here. The IPCC, global warming scientists and activists have based their conclusions about global warming on temperature records that may be excessively contaminated by the urban heat island effect. Using an innovative approach, Dr. Roy Spencer's research indicates that temp records are indeed contaminated with a warmth bias from population densities to such an extent that it may explain most of the global warming trends since 1970.
"Taken together, I believe these results provide powerful and direct evidence that the GHCN data still has a substantial spurious warming component, at least for the period (since 1973) and region (U.S.) addressed here....There is a clear need for new, independent analyses of the global temperature data…the raw data, that is. As I have mentioned before, we need independent groups doing new and independent global temperature analyses — not international committees of Nobel laureates passing down opinions on tablets of stone."