Read here and here. A large number of climate scientists are so dedicated to advocating that global warming exists, and it is caused by human CO2 emissions, they are apparently compelled to change (adjust) the actual scientific data in order to provide "proof" that what they advocate is correct. If U.S. and global measured temperatures were not adjusted by these climate scientist advocates, there would be little human CO2-caused global warming to worry about. An accurate assessment of the real temperature data would result in a determination that the global warming and climate change crisis has been juiced-up, to the potential economic and lifestyle detriment of most, and to the huge benefit of the few who stand to profit - just follow the money. (click on image to enlarge)