1900 Air Pollution

Examine this graph from FRONTLINE/NOVA: "What's Up with the Weather?" Web site to see dramatic increases in three greenhouse gases over the last two hundred years.

Agricultural Runoff and the Gulf of Mexico Dead Zone

This video segment adapted from Big River: A King Corn Companion shows how agricultural chemicals from the Midwest that travel downstream in water runoff create a vast marine "dead zone" in the Gulf of Mexico.

Ancient Farmers of the Amazon

This video segment from Evolution: "Evolutionary Arms Race" tells the story of the leafcutter ant and the fungus it farms -- an example of mutually beneficial symbiosis.

Accessibility features: Caption

Arctic Tundra

This video segment from Wild Europe: "Wild Arctic" explores the struggle for survival in one of Earth's most extreme environments.

Accessibility features: Audio Description, Caption, Transcript

Atrazine Affects the Water Supply

In this video segment featuring live-action animation, adapted from Big River: A King Corn Companion, see how the agricultural pesticide atrazine impacts both crops and human health.

Accessibility features: Caption

Biological Invaders

This video segment from Evolution: "Extinction!" shows the impact of invasive species on native ecosystems.

Accessibility features: Caption

Biomes

This interactive resource adapted from NASA describes the different temperature, precipitation, and vegetation patterns in seven biomes: coniferous forest, temperate deciduous forest, desert, grassland, rainforest, shrubland, and tundra.

Bt Corn

This video segment from FRONTLINE/NOVA: "Harvest of Fear" looks at corn that has been genetically modified to resist one insect pest, and the multiple concerns it raises.

Accessibility features: Caption

Carnivorous Plants of Texas

In this video adapted from Texas Parks and Wildlife Department, learn about carnivorous plants that act as both producers and consumers in an ecosystem. See sundews and blatterworts capture and digest insects.

Accessibility features: Caption

Caves: Extreme Conditions for Life

This video segment adapted from NOVA raises the provocative idea that if life can exist in the most extreme environments on Earth — such as in dark, toxic caves — then perhaps living things can also survive in harsh environments on other planets.

Accessibility features: Audio Description, Caption

Changing Arctic Landscape

In this video adapted from the Arctic Athabaskan Council, learn how warmer temperatures in the Arctic are transforming the landscape, triggering a host of effects such as permafrost thawing and insect infestations.

Accessibility features: Caption

Chemical Risks to a Fetus

Learn about the risks environmental contaminants pose for a developing fetus, in this video adapted from Contaminated Without Consent.

Accessibility features: Caption

Chemist and Biologist Catherine Drennan

In this video produced for Teachers' Domain, learn about MIT professor Cathy Drennan's research into microorganisms that remove carbon dioxide, a greenhouse gas, from the atmosphere.

Accessibility features: Caption

Chicken Waste and Water Pollution

In this video segment adapted from FRONTLINE: “Poisoned Waters,” learn how unregulated waste from large-scale chicken farms contributes to water pollution.

Accessibility features: Caption

Chris Schneider: Rethinking Conservation

In this interview filmed for Evolution: "Darwin's Dangerous Idea," biologist Chris Schneider discusses the relationship between conservation and speciation.

Classical vs. Transgenic Breeding

This video segment from FRONTLINE/NOVA: "Harvest of Fear" explains that genetic engineering and classical breeding both alter the genetic makeup of crop plants.

Accessibility features: Caption

Compare the Poles

Explore the defining features of the Arctic and the Antarctic in this interactive activity adapted from the Woods Hole Oceanographic Institution.

Complex Relations

In this text excerpted from chapter 3, "Struggle for Existence," of Charles Darwin's On the Origin of Species, Darwin draws on firsthand and historical information for his observations about evolution.

Contaminants in the Arctic Food Chain

The levels of contaminants found in particular animals vary widely depending on where they fit into the Arctic food chain, as described in this video segment adapted from LOKE Films and the Arctic Monitoring and Assessment Programme.

Accessibility features: Caption

Contaminants in the Arctic Human Population

In this video segment adapted from LOKE Films and the Arctic Monitoring and Assessment Programme, learn how human populations in the Arctic are affected by industrial contaminants in the food chain.

Accessibility features: Caption