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... Fast food and packaging come together. When you have eaten the beefburger, you throw away the packaging and somebody will then burn or bury it. This is clearly a problem. Fast food also contributes to global warming. In Brazil, 12 million acres of forest were cut down to build farms. Farmers use this land to grow soya beans and soya is given to the cows that become the beef in your beefburger. Fewer forests mean more global warming.