February 19, 2010

How to fake Global Warming

1. Examine data from 6000 different weather reporting stations around the globe
2. Only pay attention to the warmest weather reporting stations

Joseph D'Aleo, the first director of meteorology and co-founder of the Weather Channel, and Anthony Watts, a meteorologist and founder of SurfaceStations.org, are well-known and well-respected scientists. On Jan. 29, they released a startling study showing that starting in 1990, the National Oceanic and Atmospheric Administration (NOAA) began systematically eliminating climate-measuring stations in cooler locations around the world. Eliminating stations that tended to record cooler temperatures drove up the average measured temperature. The stations eliminated were in higher latitudes and altitudes, inland areas away from the sea and more rural locations. The drop in the number of weather stations was dramatic, declining from more than 6,000 stations to fewer than 1,500.

Mr. D'Aleo and Mr. Watts provide some amazing graphs showing that the jumps in measured global temperature occurred just when the number of weather stations was cut. But there is another bias that this change to more urban stations also exacerbates. Recorded temperatures in more urban areas rise over time simply because more densely populated areas produce more heat. Combining the greater share of weather stations in more urban areas over time with this urban heat effect also tends to increase the rate that recorded temperatures tend to rise over time.

Notice in the graph how the increase in global temperature coincides with the decrease in the number of weather reporting stations.

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