TED-Ed
What Is the Tragedy of the Commons?
What's good for all of us is good for each of us. The Tragedy of the Commons refers to a situation in which one person's decision to act in his or her own best interest negatively affects the rest of the population—and ultimately, him or...
Teacher's Pet
Types of Natural Selection
Natural selection—good things come to those who mate. The video introduces the idea of natural selection. Then it details three types: directional, stabilizing, and disruptive. It includes both graphs and examples for each type.
Crash Course
Population, Sustainability, and Malthus: Crash Course World History 215
Thomas Malthus posed the most famous, and most easily disproven, theory about projected population growth in economic history. What did he get wrong—and why? Explore the Malthusian Theory of Population with a Crash Course video that...
PBS
Nova: World in the Balance: Human Population and Global Trends
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."
Sophia Learning
Sophia: Population Growth: Lesson 2
This lesson will explain the determinants of population growth. It is 2 of 4 in the series titled "Population Growth."
Sophia Learning
Sophia: Population Growth: Lesson 3
This lesson will explain the determinants of population growth. It is 3 of 4 in the series titled "Population Growth."