each year sees the disappearance of thousands of plant and animal species which we will never know, which our children will never see, because they have been lost for ever.
each year sees the disappearance of thousands of plant and animal species which we will never know, which our children will never see, because they have been lost for ever.
human overpopulation:178
present extinction rates may be as high as 140,000 species lost per year due to human activity, such as slash-and-burn techniques that sometimes are practiced by shifting cultivators, especially in countries with rapidly expanding rural populations, which have reduced habitat in tropical forests.