Global Air Conditioner

Average temperatures have increased over the last hundred years across the US. Most temperature readings that have historical data going back one hundred years are in major cities. These major cities produce much more heat than they did one hundred years ago. This heat is generated by everything from restaurants, air conditioners and automobiles. The areas outside these cities do not produce heat from these sources but overall are not represented in the temperature readings. The rural areas need to be included to establish an average temperature. Air conditioning is powered by electricity and generating that electricity adds heat at the point of generation. The heat from buildings is moved outside. Temperature readings in cities do not measure the average temperature of the city (including inside the buildings). They measure the temperature of the city, plus the heat that has been moved outside, plus any heat that has come into the city from power generation, while not subtracting the temperature difference in buildings. Obviously cities do produce more heat than they did in the past. Scientists need to determine how much heat is moved and how much is actually produced and then average in the rural areas. Even if air conditioning is only a small difference, it shows that global temperature readings are no longer accurate since they no longer measure the average temperature. The same thing happened with national surveys. In the past few years many middle and upper class individuals have switched to unlisted numbers or screen phone calls with caller id. Phone surveys no longer could reach this group of people. They have such a margin of error to make them almost useless.