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Climate Change: Isn't It Natural?

More urban myths about climate change are busted as Potholer54 looks at the Earth's climate over the last 500 million years.

What causes it to change? Since carbon dioxide was much higher in the past, why do climatologists say higher CO2 now poses a problem? And, of course, there's the familiar myth that CO2 can't influence temperatures because the climate was much colder in the past when carbon dioxide levels were much higher.