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The Effect of 'Urban Heat Islands' - from 'Global Warming or Global Governance?'
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This clip from the film ”Global Warming or Global Governance” discusses the issue of ”urban heat islands” biasing temperature records which show that the climate is rapidly warming, due to the differences of temperatures measured in city environments as opposed to measurements taken in less populated areas.

Professor Tim Patterson, Department of Earth Sciences, Carleton University: "A common misconception amongst the general public is that temperatures are rapidly increasing. This is only with some of the surface data, and a selected surface data. In fact, much of the surface data that is collected is from around urban areas, or areas that have had significant land use change, and this data is contaminated. On the other hand, satellites provide comprehensive coverage of the Earth, [ twenty-four hours a day, seven days a week], for the last 20 years, and so what they have demonstrated is that there has been an almost imperceptible rise in temperature over this time."

But is there really much difference between temperatures in cities and that in the rest of the world?

Dr. Tim Ball, University of Winnipeg: "I did studies in Winnipeg twenty five years ago where measuring the heat on the city of WInnipeg, and we found as much as 10 degrees C difference between Portage and Maine which is supposedly the coldest part of Winnipeg, and the airport eight kilometers away."

Most cities in the world have hotter temperatures than the surrounding countryside. That has nothing to do with Carbon Dioxide, and everything to do with land use. Modern cities have concrete buildings with asphalt roofs that generate heat, which creates artificial heat that elevates the temperature that doesn't really reflect the true climate.

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