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Author Tim Flannery predicts 'new dark age' if global warming not addressed

Although many lawmakers agree that climate change is a major problem that must be addressed, consensus on a solution has been elusive thus far. During today's OnPoint, Tim Flannery, author of "The Weather Makers: How Man is Changing the Climate and What It Means for Life on Earth", discusses various "tipping points" that exist within the Earth's climate, and why these changes could prove to be irreversible. Flannery also explains why he believes a carbon tax is the most efficient way to approach climate change policy, and addresses some of the potential economic and cultural impacts of global warming.