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Global Climate Change

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The global mean surface temperature rose by 0.85 °C during the period of 1880-2012. Each of the last three decades has become successively warmer and the first decade in the 21st century has been the warmest since 1850. In the past hundred years or so, most parts of the Earth have experienced warming. 1983-2012 was likely to be the warmest 30-year period over the last 1400 years in the Northern Hemisphere.

Observed changes in global average surface temperature


Observed changes in global average surface temperature. The three surface temperature datasets originated from Hadley Centre/Climate Research Unit of the University of East Anglia, UK (black line) , US National Oceanic and Atmospheric Administration (orange line) and Goddard Institute for Space Studies, NASA (blue line). Top panel: annual mean values, bottom panel: decadal mean values including the estimate of uncertainty for HadCRUT4. (Source: IPCC AR5)

Changes in annual surface temperatures


Changes in annual surface temperatures between 1901 and 2012 derived from data maintained by Goddard Institute for Space Studies, NASA. (Source: IPCC AR5)