The conventional figure is that tree-felling causes 20% of man-made CO2 emissions, but the new paper puts that figure at closer to 12%.
一般认为砍伐树木导致了人为二氧化碳排放的20%，不过新的论文将数字修正为更接近12%。
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The fearless bird lived on the island of Mauritius until humans came along in the 1600s with their tree-felling tendencies and egg-eating pets and livestock.
It dances down its canyon much as it has since the glaciers receded 10, 000 years ago—in spring as a raging, tree-felling torrent, in late summer as a spare, crystalline rivulet.