어떤 보고에 따르면 미국에서만 한때 숲이었다가 지금은 초원으로 변한 육지의 2/3 가 나무꾼과 농부들이 되돌아오면서 다시 삼림화되었습니다. 특히 동부 쪽이 그렇습니다.
There's one estimate which suggests that in the United States, two thirds of the land which was once forested and then cleared has become reforested as loggers and farmers have retreated, particularly from the eastern half of the country.