Atmospheric Carbon Dioxide Levels

Earth is warming because of an increase in greenhouse gases, including carbon dioxide (CO₂). Explore what can be done to slow or stop continued climate change.

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CO₂ Concentrations at Mauna Loa Observatory, Hawaiʻi

This resource, adapted from the Carbon Dioxide Information Analysis Center, provides a graph of monthly average carbon dioxide (CO₂) concentration from 1958 to 2000 at the Mauna Loa Observatory in Hawaiʻi.

Decreasing California Snowpack

Approximately 40 percent of California's surface water supply originates from the snowpack in the Sierra Nevada Mountains. However, climate change is significantly altering this precious water source.

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Global Warming: Graphs Tell the Story

Examine graphs from the NOVA/FRONTLINE Web site to see dramatic changes in the temperature of Earth's surface and in the levels of greenhouse gases in the atmosphere.

Global Weather Machine

In this illustrated essay from NOVA Online, explore the cyclical process of weather creation and the effects of El Niño on the global weather system.

The Greenhouse Effect and Greenhouse Gases

Increasing greenhouse gases are contributing to global warming, which is changing our climate.

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Hurricane Katrina: Possible Causes

This media-rich essay from NOVA scienceNow explores new research into hurricanes that may help explain Katrina's devastating impact and discusses the possibility that global warming played a role.

Life's Little Essential: Liquid Water

Why is water necessary for life? Why is it the best and possibly only liquid to do the job? This illustrated essay from NOVA Online answers these questions, explaining why planetary scientists are on the lookout for water elsewhere in the solar system.

Projected Sea Level Rise

Climate change is affecting our oceans in more ways than one. Explore how climate change is affecting sea levels.

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Pulsars: Little Green Men

The story behind Jocelyn Bell's role in the discovery of pulsars is told in this colorful, comic-book-style resource from A Science Odyssey Web site.

Water Planet: How the Water Cycle Works

The climate change-induced animations produced by KQED, are designed to illustrate changes to the water cycle that may occur over many years.

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Wave of the Future

This media-rich essay from NOVA Online describes the challenges involved in installing a warning system for tsunamis in the Indian Ocean.