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Summary: Changing climate probably played the decisive role in drawing hominids out of the trees, up on their hind legs, and off in search of food whose supply had been dispersed by the replacement of rainforests by grasslands. Migrations were motivated by the search for food; during ice ages, when sea levels dropped, new areas became accessible and populations spread. Links between climatic changes and...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2006

View online at AVOD

Summary: As visually spectacular as it is informative, this program thoroughly surveys the world's varied climate systems. Using simple color-coded maps based on the Koppen classification system, the video identifies the characteristics of the following zones: humid tropical climates, wet-dry tropics, dry climates, subtropical and mid-latitude deserts and steppes, humid mid-latitude climates, humid...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2005

View online at AVOD

Summary: People everywhere are interested in the weather, but how does it all work? Beginning with Earth's atmosphere-its evolution, its gaseous composition, and its four regions-this video takes a close look at how conditions combine to create climate and weather. Topics include the Koppen Climate Classification System; weather prediction; types of clouds and precipitation; thunderstorms, tornadoes,...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2006

View online at AVOD

Summary: By building roads, watering crops, and grazing cattle, we are constantly changing the climate. We may also modify the weather by cloud seeding, though there is no scientifically accepted proof that rain or snow would not have occurred naturally in cases where seeding appears to have been successful. This program shows how migration in the Sahel has altered regional climate; examines the...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2006

View online at AVOD

Summary: A life-sustaining envelope of gas surrounds the earth. This atmosphere contains oxygen, CO2, water vapor, and other gases-it is what generates climate, which affects all living beings. This program analyzes the sun's gradual brightening and the relationship between sunlight and CO2, explains why the atmospheres of Mars and Venus cannot sustain life, theorizes about the disappearance of...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2006

View online at AVOD

Summary: The most striking feature of life on Earth is its richness and variety. But research shows that the planet's biodiversity is seriously threatened with destruction by human activities. From the depths of the oceans to the tops of rainforest canopies, from the African savannas to the soil underfoot, this program hosted by David Attenborough reveals the extent of that living bounty-and the...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2005

View online at AVOD

Summary: The history of Earth has been a history of temperature change; people and animals have historically moved to better climes, richer pastures, and areas of more abundant food. The problem now is that "somewhere else" is already occupied; meanwhile, temperatures appear to be rising, with foreseeably disastrous consequences. The gases in the air which cause the greenhouse effect have made life...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2006

View online at AVOD

Summary: If the threat of global warming has been created by our reckless use of technology, can we use technology to eliminate the threat? We could try to cool the earth by deliberately polluting the atmosphere, as volcanoes do, but suppose we overcooled the planet, creating another ice age? This program suggests some less drastic solutions to the problem of global warming: reducing CO2 emissions;...

Format: software, multimedia

Publisher / Publication Date: Films Media Group 2006

View online at AVOD

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