Global warming is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and still in continuation. Since the early 20th century, Earth's mean surface temperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980. Warming is expected to be strongest in the Arctic and would be associated with the continuing retreat of glaciers, permafrost and sea ice.
In relation with the issue of global warming, Greenland Post issued the commemorative stamps on a nicely designed miniature sheet which features the damaging effects of global warming in mind and how this is causing major problems to the population of Polar Bears in Greenland and the surrounding areas. The miniature sheet comprises of two postage stamps which released on the first of May 2010.