Thermometers show the US cooling since about 1920, but NOAA massively cools the past to create the appearance of a warming trend. These adjustments make a spectacular hockey stick of data tampering. When plotted against atmospheric CO2, the correlation is almost perfect. NOAA is tampering with the data exactly to match their theory.
http://realclimatescience.com/2016/11/noaa-adjustments-correlate-exactly-to-their-confirmation-bias/
http://realclimatescience.com/2016/11/noaa-adjustments-correlate-exactly-to-their-confirmation-bias/