To check population growth is necessary when______.
A.there are decreasing productivity gains B.there are increasing productivity losses C.we are close to reaching the sustainability limits at a world level D.people become a cost正确答案C
To check population growth is necessary when______.
A.there are decreasing productivity gains B.there are increasing productivity losses C.we are close to reaching the sustainability limits at a world level D.people become a cost正确答案C
