afrotropic ecozone alaska alpine climate altitude antarctic peninsula antarctic ecozone antarctica antipodes islands antipodes subantarctic islands tundra arctic vegetation argentina auckland islands australasia ecozone benthic zone biodiversity biodiversity action plan biome bounty islands campbell island group canada carbon carbon dioxide cat chinchilla conservation movement continental shelf coral reef cyperaceae desert deserts and xeric shrublands digital object identifier ecoregion ecotone ecozone endolith european russia fellfield flooded grasslands and savannas geography global warming greenhouse gas heath ice cap iceland indomalaya ecozone intertidal zone kea kelp forest kerguelen islands kildin sami krummholz latitude lemming lichen list of tundra ecoregions littoral zone macquarie island mangrove marchantiophyta marmot montane grasslands and shrublands moss mountain goat nearctic ecozone neotropic ecozone neritic zone nganasan people nomad northern hemisphere oceania ecozone palearctic ecozone pelagic zone penguin permafrost petroleum pika pinniped poaceae polar bear pond rabbit reindeer russia sami people siberia south america south georgia and the south sandwich islands steppe-tundra subarctic climate taiga temperate broadleaf and mixed forests tibetan plateau tierra del fuego tree tree line tropical and subtropical coniferous forests tropical and subtropical dry broadleaf forests tropical and subtropical moist broadleaf forests uranium wikimedia commons world wide fund for nature