A companion site to Nova's film that examines "human populations and environments." Find some fascinating facts in the interactive slide shows "Human Numbers Through Time," and "Global Trends Quiz."

Hank is here to tell us the specifics of why and how human population growth has happened over the past hundred and fifty years or so, and how those specifics relate to ecology. [10:53]

A teacher-created Geography lesson on population movement. He discusses the push and pull factors that drive people to leave a place and move to a new place, and how some migrations are voluntary, while others are involuntary or forced....

A teacher-created video that focuses on the push and pull factors and intervening obstacles that impact upon why people migrate. [12:49]

Where do most people live? What do nations do in an effort to understand their own population distribution? This short video introduces the concepts of population distribution and density. [1:04]

Mr. MacAlpine explains the patterns of human settlement and population distribution in Canada and the world, as well as some of the factors that contribute to population density. [15:48]

Just over two centuries ago in 1804, the global population was 1 billion. But better medicine and improved agriculture resulted in higher life expectancy for children, dramatically increasing the world population, especially in the West....

Mr. MacAlpine explains how geographers compare the standard of living in various countries around the world, using living standard, literacy, gross domestic product and human development index. [8:38]