This image shows the instrumental record of global average <a href="https://en.wikipedia.org/wiki/temperature" class="extiw" title="w:temperature">w:temperatures</a> as compiled by the <a href="https://en.wikipedia.org/wiki/NASA" class="extiw" title="w:NASA">w:NASA</a>'s <a href="https://en.wikipedia.org/wiki/Goddard_Institute_for_Space_Studies" class="extiw" title="w:Goddard Institute for Space Studies">w:Goddard Institute for Space Studies</a>. (2006) "Global temperature change". Proc. Natl. Acad. Sci. 103: 14288-14293. Following the common practice of the <a href="https://en.wikipedia.org/wiki/IPCC" class="extiw" title="w:IPCC">w:IPCC</a>, the zero on this figure is the mean temperature from 1961-1990. This figure was originally prepared by <a href="https://en.wikipedia.org/wiki/User:Dragons_flight" class="extiw" title="w:User:Dragons flight">Robert A. Rohde</a> from publicly available data and is incorporated into the Global Warming Art project.
<a rel="nofollow" class="external free" href="http://data.giss.nasa.gov/gistemp/graphs/">http://data.giss.nasa.gov/gistemp/graphs/</a>