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After four years of one of the most rigorous peer reviews ever, Canadian Ross McKitrick and another of us (Michaels) published a paper searching for "economic" signals in the temperature record. McKitrick, an economist, was initially piqued by what several climatologists had noted as a curiosity in both the U.N. and satellite records: statistically speaking, the greater the GDP of a nation, the more it warms. The research showed that somewhere around one-half of the warming in the U.N. surface record was explained by economic factors, which can be changes in land use, quality of instrumentation, or upkeep of records. This worldwide study added fuel to a fire started a year earlier by the University of Maryland's Eugenia Kalnay, who calculated a similar 50 percent bias due to economic factors in the U.S. records.

ROFLMAO!...

This is such a classic situation. Better technology yields a bias toward better science. By the way, the "speed of light" has also been increasing, according to the measurements of it since the mid 1800s... Maroons! ... It never seems to occur to people when they are looking at historical methods that we really DO manage to do things better.

The world is getting warmer for the most part because the Sun is hotter ... PERIOD. See:
The truth about global warming