arctic circle
birds
birds of arctic
climate change
ecology
emissions of carbon dioxide into atmosphere
environmental problems
extinction of species of animals
floating ice
glacial
greenhouse effect
ice caps
icy
inhabitants of arctic
melting of ice
melting of polar
north pole
ornithology
pack ice
penguins
rare birds
sea
seashore
seaside
thickbilled murre
warming
waterfowl
zoology