World Environment News - Woolly Mammoth Hunters Helped Change Climate - Planet Ark: "Ancient hunters who stalked the world's last woolly mammoths likely helped warm the Earth's far northern latitudes thousands of years before humans began burning fossil fuels, according to a study of prehistoric climate change.
The demise of the leaf-chomping woolly mammoths contributed to a proliferation of dwarf birch trees in and around the Arctic, darkening a largely barren, reflective landscape and accelerating a rise in temperatures across the polar north, researchers at the Carnegie Institution for Science concluded"
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