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environmentalists at Greenpeace have been working with some of the world's biggest food makers - among them Coca-Cola (KO, Fortune 500), McDonald's (MCD, Fortune 500) and Unilever - to deploy refrigerators in supermarkets and convenience stores that are free of hydrofluorocarbons (HFCs), which are potent greenhouse gases.

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More than one million new cases of skin cancer are diagnosed each year and more than 10,000 people will die as a result in the United States alone. That's nearly 90 percent more skin cancer than in the 1960s.

Although the scientific evidence wasn't especially strong 20 years ago, 24 nations headed by Argentina, the United States and Canada took a precautionary approach and signed the Montreal Protocol on Substances that Deplete the Ozone Layer. That foresight prevented the further destruction of the ozone layer and, by good fortune, kept the equivalent of tens of billions of tonnes of additional carbon dioxide out of the atmosphere.

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