I think the population problem is one of the greatest problems.<br />Yes, the world's population is growing faster and faster.<br />In about 600 years, there will be only standing room on the Earth.<br />I think the population problem is one of the greatest problems.<br />Yes, the world's population is growing faster and faster.<br />In about 600 years, there will be only standing room on the Earth.
A . The place people stand.B . The world's population.C . The pollution.
