Human overpopulation is putting pressure on our planet and its natural resources. The more people there are, the more resources are consumed, harming the environment and depleting the world's supplies. Discover the facts about the world's growing population, which countries have the highest and lowest birth rates, and how overpopulation affects climate change.

What is overpopulation? -- Population density -- Focus on Singapore -- Births and deaths -- Focus on Niger -- Focus on Russia -- Migration -- Focus on Syria.