A NASA animation of temperature change since 1880
NASA Animation of Temperature Data from 1880-2011
Via The Climate Desk, “a journalistic collaboration dedicated to exploring the impact—human, environmental, economic, political—of a changing climate. The partners are The Atlantic, Center for Investigative Reporting, Grist, The Guardian, Mother Jones, Slate, Wired, and PBS’s new public-affairs show Need To Know.”
It's interesting how it trails off in the mid 20th century then makes a gigantic turn for the hot.
It would be interesting to see what it looked like before all of the ice ages. Probably about like it does now because the Earth goes through hot and cold cycles.