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If the warming exceeds - or thereabouts, there is a significant risk of the entire ice sheet being lost over an estimated 10,000 years, adding up to global sea levels. Warming in the Arctic may affect the stability of the jet stream, and thus the extreme weather events in midlatitude regions, but there is only "low confidence" in that hypothesis.
With wildfires and increased warming, scientists say the Arctic’s tundra is now a carbon source. The region had been a carbon sink for thousands of years (NOAA Climate.gov; Arctic Report)
500 million years of climate change Ice core data for the past 400,000 years, with the present at right. Note length of glacial cycles averages ~100,000 years. Blue curve is temperature, green curve is CO 2, and red curve is windblown glacial dust (loess).
Recent warming has driven many terrestrial and freshwater species poleward and towards higher altitudes. [215] For instance, the range of hundreds of North American birds has shifted northward at an average rate of 1.5 km/year over the past 55 years. [216] Higher atmospheric CO 2 levels and an extended growing season have resulted in global ...
Much of the United States is shivering through brutal cold as most of the rest of the world is feeling unusually warm weather. Wind chills in parts of North Dakota reached minus 70 degrees (minus ...
Beginning on January 2, 2014, sudden stratospheric warming (SSW) [dubious – discuss] led to the breakdown of the semi-permanent feature across the Arctic known as the polar vortex. Without an active upper-level vortex to keep frigid air bottled up across the Arctic, the cold air mass was forced southward as upper-level warming displaced the ...
Things are heating up at the top of the world about four times faster than the rest of the globe, according to new research on the Arctic, where some of the
Northeastern North America experienced peak warming 4,000 years later. Along the Arctic Coastal Plain in Alaska, there are indications of summer temperatures 2–3 °C warmer than now. [11] Research indicates that the Arctic had less sea ice than now. [12] The Greenland Ice Sheet thinned, particularly at its margins. [13] In addition to being ...