Long description

This is a line chart showing the historical change s in global mean surface temperature. It has an x axis running from 1850 to 2020. The y axis scale is labelled Global mean surface temperature rise in degrees celsius. The scale runs from minus 0.5 degrees celsius up to 1.5 degrees celsius. The chart starts with a unevenly varying line at approximately zero degrees between 1850 and 1900. It is slightly below zero between 1900 and 1920 and then rises to about 0.3 degrees in 1945. It is around 0.25 degrees between 1950 and 1970, after which it starts rising but unevenly right up to about 1.2 degrees in 2020. There is a horizontal blue line showing the average as zero between 1850 and 1900. There is also a short horizontal brown line between 2011 and 2020, showing the average as 1.1 degrees. A grey vertical arrow between the levels of these two lines is labelled 1.1 degrees celsius rise.