Learn about the mysterious jellyfish blooms that have occurred in the world's oceans. Because the resulting alteration to the marine food web has had devastating effects, researchers grow and study jellyfish at the Monterey aquarium....

An experiment where several containers are set up with different numbers of seeds planted in each. The objective is to investigate how seed density affects the health of the plants that grow.

Every year since 2006 eVolo, an architecture magazine, sponsors a futuristic skyscraper design contest in which architects from around the world communicate their visions of the future in architectural terms. Browse the winning entries...

Why did great civilizations fall? War, disease, overpopulation or natural disasters? Interactive content and activities allow you, by sifting through archaeological evidence, to investigate the collapse of the Mayan civilization, the...

Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water. These...

In 1968, Garrett Hardin sat down to write an essay about overpopulation. Within it, he discovered a pattern of human behavior that explains some of history's biggest problems. Nicholas Amendolare describes the tragedy of the commons.

Check out a table of census statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

Elementary students will appreciate these stories of how man's appearance on planet Earth affected all creatures and life!

A homepage of the International Society of Malthus, a group dedicated to the history and teachings of Thomas Malthus. Includes data on human population and contemporary essays on Malthus' teachings. Includes a link to an online version...

Cornell University provides an essay in tribute to the ideas of Thomas Malthus. Some good biographical material included as well.

Understand that an ecosystem such as the Kalahari has a system of checks and balances to ensure that no species overpopulates and threatens the survival of other species. Chart a food chain and explore the balance between predator and prey.

Unlike Norwegian Lemmings, Brown Lemmings do not migrate en masse when they overpopulate their homes in the treeless regions of the north, but they do tend to wander. These are stout-bodied, herbivorous rodents with extremely short...

Organization dedicated to "advancing policies and programs that slow population growth in order to enhance the quality of life for all people." The site includes country by country data on population, natural resources and data...

[Free Registration/Login may be required to access all resource tools.] Describes how the human population is rapidly expanding.

This group seeks to stabilize the population growth in America by limiting immigration. They present their platform and possible solutions.

U.S. Census Bureau statistics involving 40+ subdivisions of the U.S. population and statistics involving these demographics.

The Audubon Society focuses its efforts on attempting to slow the population explosion through various publications and resources.

This is the official home of Population Connection (formerly Zero Population Growth), a non-profit organization focused on slowing population growth. This site offers current information on government legislation and policy in this...

This resource attempts to assist developing countries manage their population problems.

This site from American Institute of Biological Sciences provides a collection of articles on current issues in environmental science and human impacts on the environment. Several articles available in Spanish.

Have we used up all our resources? Have we filled up all the livable space on Earth? Paul Gilding suggests we have, and the possibility of devastating consequences, in a talk that's equal parts terrifying and, oddly, hopeful. [16:47]

[Free Registration/Login may be required to access all resource tools.] Describes how the human population is rapidly expanding.

[Free Registration/Login may be required to access all resource tools.] Describes future population growth.

How is the human population changing? This quiz covers population trends in the developed world, and the developing world. Explore the impact human population growth is having on the environment.