Global Land ocean temperatures NASA GISS. In the past three decades, the GISS surface temperature record shows an upward trend of about 0.36 degrees F (0.2 degrees C) per decade. In total, average global temperatures have increased by about 1.5 degrees F (0.8 degrees C) since 1880. http://www.nasa.gov/home/hqnews/2010/jan/HQ_10-017_Warmest_temps.html
Line plot of global mean land-ocean temperature index, 1880 to present, with the base period 1951-1980. The dotted black line is the annual mean and the solid red line is the five-year mean. The green bars show uncertainty estimates.
http://data.giss.nasa.gov/gistemp/graphs_v3/ http://climate.nasa.gov/key_indicators#globalTemp