Over the past centuries, as people have cleared fields for farms, built roads and highways and expanded cities outward, trees have been cut down. Since 1850, global forest cover has been reduced by one-third. The way forests look has also been changed: much of the world’s woodlands now exist in choppy fragments, with 20% of the remaining forest within 100 m of an edge like a road, back yard, corn field or parking lot.
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