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Rising temperatures have brought a longer growing season in the high latitudes. Once-treeless tundra ecosystems have greened the most, while boreal forests had a more mixed response.
The maps show a ring of greening in the treeless tundra ecosystems of the circumpolar Arctic—the northernmost parts of Canada, Russia, and Scandinavia. Tall shrubs and trees started to grow in areas that were previously dominated by tundra grasses. The researchers concluded that plant growth had increased by 7 to 10 percent overall.
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