You cannot build an accurate model without accurate data.

GIGO

The United States and especially the global data bases have serious problems that render them highly questionable for determining accurate long term temperature trends. Especially since most of the issues mentioned produces a warm bias in the data.

As stated earlier and shown here, though there has clearly been some cyclical warming in recent decades (most notably 1979 to 1998) confirmed by satellites, the global surface station based data is seriously compromised by urbanization and other local factors (land-use /land-cover, improper siting, station dropout, instrument changes unaccounted for and missing data) and thus the data bases overestimate the warming. Numerous peer-reviewed papers (referenced below in bold) in the last several years have shown this overestimation are the order of 30 to 50% from these issues alone.

source

UHI=GI

There are many possible causes for the warming observed up through the 90s, including corrupt data, as the linked article argues, but how many climate models have predicted the recent cooling? Could you cite even one? Doesn't the recent cooling, in fact, falsify the entire theory of AGW?

Just wondering is all.

S