Scientists believe that about 10% of the permafrost in the Northern hemisphere has defrosted since 1900. One of the biggest problems caused by this thaw is that as the ice melts the organic materials in the soil beneath start to rot.
Scientists believe that about 10% of the permafrost in the Northern hemisphere has defrosted since 1900. One of the biggest problems caused by this thaw is that as the ice melts the organic materials in the soil beneath start to rot.