Trends for the future

Surface Temperatures

Temperatures have increased in most parts of the world, with many of the largest increases occurring in the high latitude land areas of the Northern Hemisphere. Source: NOAA

"Global climate models suggest that the Arctic atmosphere will respond strongly to increasing concentrations of greenhouse gases. Hence the Arctic atmosphere could provide an early indication that greenhouse gases are affecting the earth's climate. [...] While the Arctic warming of the recent decades may have multiple causes, longer temperature reconstructions from paleoclimatic data (tree rings, ice cores, temperature records) indicate that the Arctic was warmer during the 20th century than at any time since 1600."
John Walsh, Professor of Atmospheric Sciences University of Illinois