The document discusses how world population has changed since 1960. In 1960, world population was around 3 billion, with 1 billion people in the industrialized world and 2 billion in the developing world. Since then, world population has doubled to over 7 billion. Many developing countries have become emerging economies, though the poorest 2 billion people still struggle. The speaker uses a box containing toy people to illustrate population shifts between 1960-2010 and projections to 2050. By 2050, population growth is expected to slow as more people rise out of poverty and access education, bicycles, and cell phones, having smaller families. However, the poorest areas could see population grow to 4 billion without intervention.