This is a key to a <a href="//commons.wikimedia.org/wiki/File:World_map_showing_surface_temperature_trends_between_1950_and_2014.png" title="File:World map showing surface temperature trends between 1950 and 2014.png">world map showing surface temperature trends between 1950 and 2014</a>. Temperature trends range from -0.5 to +0.5 degrees <a href="https://en.wikipedia.org/wiki/Celsius" class="extiw" title="en:Celsius">celsius</a> per decade, and are shown by color gradients:
<ul><li>Cooling trend: dark to light blue</li>
<li>No trend: white</li>
<li>Warming trend: light to dark orange</li></ul>
NASA/GSFC/<a href="https://en.wikipedia.org/wiki/NASA_Earth_Observatory" class="extiw" title="en:NASA Earth Observatory">Earth Observatory</a>, <a href="https://en.wikipedia.org/wiki/NASA" class="extiw" title="en:NASA">NASA</a>/<a href="https://en.wikipedia.org/wiki/GISS" class="extiw" title="en:GISS">GISS</a> (also see <a href="https://en.wikipedia.org/wiki/NOAA" class="extiw" title="en:NOAA">en:NOAA</a>)
2016-01-07
SVG version of picture <a href="//commons.wikimedia.org/wiki/File:Key_to_world_map_showing_surface_temperature_trends_between_1950_and_2014.png" title="File:Key to world map showing surface temperature trends between 1950 and 2014.png">File:Key to world map showing surface temperature trends between 1950 and 2014.png</a>. 16 January 2015: <a rel="nofollow" class="external text" href="http://www.giss.nasa.gov/research/news/20150116/">NASA, NOAA Find 2014 Warmest Year in Modern Record</a>, in: Research News. <a href="https://en.wikipedia.org/wiki/NASA" class="extiw" title="en:NASA">NASA</a> <a href="https://en.wikipedia.org/wiki/Goddard_Institute_for_Space_Studies" class="extiw" title="en:Goddard Institute for Space Studies">Goddard Institute for Space Studies</a>, New York, NY, USA. Accessed 20 February 2015.