English: This graph is an edited version of the public domain image here and shows the increase in temperature in the U.S. according to the 1218 stations in NOAA’s Historical Climatology Network (USHCN), with yearly data going from 1950 to 2009. It incorporates information from the article- Watts, Anthony, 2009: "Is the U.S. Surface Temperature Record Reliable?" The Heartland Institute, Chicago. 29 pp.