Ecosystems Weddell Sea South Georgia Ice Sheets Research Stations West Antarctica Icebergs Ice Shelves Glaciers Antarctic Peninsula Thwaites Glacier Geographical Features Southern Ocean Islands West Antarctic Ice Sheet Chilean Territory King George Island Polar Regions Geological Features Bellingshausen Sea Chilean Territories Wildlife Wildlife Habitats Iceberg East Antarctica Research Bases South Pole McMurdo Station Sub-Antarctic Islands Amundsen Sea Brunt Ice Shelf Halley Bay White Continent Antarctic Coasts Marie Byrd Land British Antarctic Survey Antarctic Habitats Doomsday Glacier Rothera Research Station Thwaite's Glacier Mainland Antarctica Wildlife Impact Atka Bay Antarctic Wildlife Antarctic Exploration Hudson Mountains Geographic Features Biodiversity Research Expeditions North America Chilean Antarctic Territory Volcanoes Volcanic Regions Coastal Communities Argentina Antarctic Icebergs Regions of Antarctica Eclipse Viewing Locations Airfields British Antarctic Territory Geographic Research Ice Features Ross Ice Shelf Allan Hills McMurdo Dry Valleys Filchner Ice Shelf Climate Zones Ross Sea Glacial Regions Marine Geography Climate History Antarctic Ecosystems International Law Chile Unique Ecosystems Unique Environments Ice Cores Geographic Vulnerability Sub-Antarctic Regions Coastal Ecosystems Glacial Geography Landforms Environmental Changes Tourism in Antarctica Tourism Cruise Destinations Cruise Routes Travel Destinations Tourist Destinations Travel Routes Winter Vernadsky Research Base South Georgia Island Paleogeography Isla Rey Jorge Casey Research Station Australian Antarctic Division Eastern Antarctica Ring of Fire Polar Research
Trapped air in Allan Hills blue‑ice cores reveals unexpectedly low and steady greenhouse‑gas concentrations in the late Pliocene and early Pleistocene.
