[T]he raw data, the actual thermometer data[...] shows that the US has been cooling for 80 to 90 years. But the graphs they release to the public show warming trend, and it's all because they've altered the data.

[NASA] has been adjusting temperatures from the past[...] downward, while adjusting current-day temperatures upward, and those changes are responsible for most of the claimed global warming during that time.