%T Policy implications of warming permafrost %I United Nations Environment Programme %D 2012 %K Climate change %U https://apo.org.au/node/32074 %X Permafrost is perennially frozen ground occurring in about 24% of the exposed land surface in the Northern Hemisphere. The distribution of permafrost is controlled by air temperature and, to a lesser extent, by snow depth, vegetation, orientation to the sun and soil properties. Any location with annual average air temperatures below freezing can potentially form permafrost. %9 Report