What is the estimated world population by the year 2050, according to the text?, Why is rising income in developing countries like India and China leading to greater environmental pressure?, What digestive gas do animals produce, and how does it contribute to climate change?, According to the Institute of Mechanical Engineers, how much water is needed to produce one kilo of beef compared to one kilo of potatoes?, How does animal farming contribute to deforestation and reduced carbon absorption?, What factors cause the 6,000-square-mile "dead zone" in the Gulf of Mexico?, How many people in the United States are estimated to be vegetarian and vegan?

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