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American Society of Gene and Cell Therapy

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American Museum of Natural History:  All About Cloning

Cloning and Conservation (video from AMNH)

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PBS.org Phillip Longman and Julia Whitty on the Population Conversation (video clip)

PRB Human Population: Population Growth

Nova:  World in the Balance: Earth in Peril (interactive and more links)

World Resources Institute

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Genetic Literacy Project:  GMO FAQ

PBS:  Harvest of Fear

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CDC: Antibiotic/Antimicrobial Resistance

Arms Race with a Superbug (interactive)

Killer Microbe:  Expert Q & A

Roundtable Discussion:  The Evolving Enemy

Microbe Clock (simulation/investigation)

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Hippo Facts

Population status and human conflict of common hippopotamus

U.S. Fish & Wildlife Service: Endangered Species

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Mass extinction survival is more than just a numbers game

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The 5 worst mass extinctions

The Big 5 Mass Extinctions

Mass Extinction Theories (causes)

Mass Extinction:  What Causes Animal Die-Offs?

Great Mysteries - What Causes Mass Extinctions?

Mass Extinction (video)

Volcanic Violence

What Killed the Dinosaurs (interactive)

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Stanford researcher declares that the 6th mass extinction is here

Will Humans Survive the 6th Great Extinction?

The Sixth Extinction

Roundtable Discussion:  A Modern Mass Extinction?

Earth on the Brink (various articles)

Earth is on the Brink of a Sixth Mass Extinction, Scientists Say, and it's Humans Fault

Here's More Proof Earth is in It's  6th Mass Extinction

Earth Heading for Another Mass Extinction, Scientists Warn

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Climate Effects on Human Evolution

How Much Does Human Activity Affect Climate Change?

A Blanket Around the Earth