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2) Atmosphere
Description
The atmosphere is what makes the Earth habitable. Heat-trapping gases allow ecosystems to flourish. While the NOAA Global Monitoring Project documents the fluctuations in greenhouse gases worldwide, MIT's Prof. Kerry Emanuel looks at the role of hurricanes in regulating global climate.
Description
The early Earth was a much different planet than the one we know today. Ancient rocks provide evidence of the emergence of oxygen in the atmosphere and of a frozen Snowball Earth. Scientists Paul Hoffman and Andrew Knoll look at these clues to help explain the rise of complex animal life.
Description
Global energy use increases by the day. Polluting the atmosphere with ever more carbon dioxide is not a viable solution for our future energy needs. Can new technologies such as carbon sequestration and ethanol production help provide the energy we need without pushing the concentrations of CO2 to dangerous levels?
5) Agriculture
Description
Will world population outrun food resources? The "Green Revolution" of the 20th century multiplied crop yields, in part through increasing inputs of pesticides and fertilizers. How can farmers reduce their use of agricultural chemicals and still produce enough food?
Description
Tropical glaciers are the world's thermometers; their melting is a signal that human activities are warming the planet. A California project tries to predict whether natural ecosystems will be able to absorb enough additional carbon dioxide from the atmosphere in the next 50 years to mitigate the full impact of human-induced greenhouse gas emissions.
7) Ecosystems
Description
Scientists from the Smithsonian Center for Tropical Research document the astounding abundance of diversity in tropical rainforests to discover why so many species coexist that are competing for the same resources. In North America, the Yellowstone Wolf Reintroduction project explores why removing just one species dramatically changed the distribution of plants and animals up and down the food web.
Description
Species are being lost at a rapid rate in rainforests and coral reefs. Yet many species still have not been discovered. Tropical scientists struggle to keep ahead of the bulldozers as they work to understand this complex ecosystem. And an ocean biologist predicts the death of life and the "rise of slime" in the sea. How can we protect the biodiversity of these vulnerable ecosystems?
Description
Once released, air pollutants react chemically with each other under solar radiation to become even more dangerous secondary pollutants. A company in the Northeast U.S. tracks the emission of pollutants at street level, while an international long-term study follows plumes of pollution from Mexico City across the continent and beyond.
11) Oceans
Description
Ocean systems operate on a range of scales, from massive systems such as El Niño that affects weather across the globe, to tiny photosynthetic organisms near the ocean surface that take in large amounts of carbon dioxide. This program looks at how ocean systems regulate themselves and thus help maintain the planet's habitability.
Description
This collection of 40 video clips (1 minute 10 seconds each) addresses concerns about--and threats to--the sustainability of life on Earth as global warming increases in severity. The collection also spotlights recycling and alternative energy, keys to building a brighter future for the planet.
Description
Will environmental changes brought about by humans eventually destroy the potential for males of all species to reproduce? This Emmy Award-winning documentary explores that frightening possibility. Using sophisticated investigative techniques, scientists trace the ripple effect of estrogenic compounds in the environment. At first, we observe slight changes in the natural order, then witness the wider effects: seriously altered ecosystems and the disruption...
Description
(Webmaster) Follow the story of Professor Bob Di Donato and Marion, his assistant, as they create a German course using a "German studies" approach. They weave together minidramas set in Germany, interviews with native speakers, and documentary footage on history and culture, all of which help increase fluency in and comprehension of the language. The narratives, presented in natural, authentic German, cover topics such as school, employment, travel,...
Description
The microscope's role as an indispensable piece of laboratory equipment is well-recognized. This program illustrates the fundamentals of microscope use. Its six segments discuss the basic parts of a microscope, lighting techniques for maximum vision, preparing specimens for viewing, care of the microscope, and advanced techniques, such as the use of oil immersion and video microscopy.
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