Increasing human number places intense pressure on ecosystems and natural resources, and this pressure is expected to increase until world population stabilizes at about 10 billion by 2050 to 2070. （However, this stabilization will be achieved only i

Increasing human number places intense pressure on ecosystems and natural resources, and this pressure is expected to increase until world population stabilizes at about 10 billion by 2050 to 2070. （However, this stabilization will be achieved only if present efforts to check population growth are pursued vigorously.）

但是，只有现在继续强有力地控制人口增长，才能达到人口稳定。