The old adage says, "There are none so blind as those who refuse to see." Two months after the Climategate scandal rocked the scientific world, new allegations have been made that temperature data being skewed in a different way: selective ignorance. CanWest reports.

Two American researchers allege that U.S. government scientists have skewed global temperature trends by ignoring readings from thousands of weather stations around the world, particularly those in colder altitudes and more northerly latitudes, such as Canada...

D'Aleo and Smith say NOAA and another U.S. agency, the NASA Goddard Institute for Space Studies (GISS) have not only reduced the total number of Canadian weather stations in the database, but have "cherry picked" the ones that remain by choosing sites in relatively warmer places, including more southerly locations, or sites closer to airports, cities or the sea -- which has a warming effect on winter weather.

Over the past two decades, they say, "the percentage of (Canadian) stations in the lower elevations tripled and those at higher elevations, above 300 feet, were reduced in half."

Using the agency's own figures, Smith shows that in 1991, almost a quarter of NOAA's Canadian temperature data came from stations in the high Arctic. The same region contributes only three per cent of the Canadian data today.

D'Aleo and Smith say NOAA and GISS also ignore data from numerous weather stations in other parts of the world, including Russia, the U.S. and China.

They say NOAA collects no temperature data at all from Bolivia -- a high-altitude, landlocked country -- but instead "interpolates" or assigns temperature values for that country based on data from "nearby" temperature stations located at lower elevations in Peru, or in the Amazon basin.

The result, they say, is a warmer-than-truthful global temperature record.

There's plenty more examples in the CanWest article. A preliminary 10-page report by Joseph D'Aleo is available. The video above is part of a five-segment video series.