More than 80% of the world's people live in developing countries and nearly 40% of them are children and teenagers. While population growth is near zero in the world's richest countries, rapid growth in low and medium-income countries is contributing many potential workers and consumers to the world's economy.
The world is getting wealthier and the economies of poor countries are developing, yet poverty remains a major problem. Nearly four in five people in the world are considered poor, existing on less than US$10 per day. The availability of affordable energy will be critical to raise their standard of living. Meanwhile, many of the world's ecosystems are under stress, and will become more so as an increased population puts increased demand on resources.