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 In many ways, the increasingly rapid pace of climate change is a direct result of the growth of the human population. In the last 100 years, the world population has more than tripled, from just under 2 billion at the beginning of the century to nearly 7 billion today. In addition, the average person uses more energy and natural resources than the average person one hundred years ago, meaning that the rates of consumption are actually much higher than just the increase in population would imply. For example, it took the world 125 years to use the first one trillion barrels of oil. The next trillion barrels will be used in less than 30 years, which is almost 5 times as fast, not three.

All of these activities: food production, energy usage, and the use of natural resources, contribute to climate change in some way. The greater amounts of oil and other fuels burned to create energy release chemicals which add to global warming. In order to produce more food, farmers cut down trees to gain more land for their fields. In addition, we cut down trees to build the houses needed for a larger population. Those trees are an essential part of controlling global warming; others are too numerous to mention.

 In addition to a growing population, the world also has a population that desires a higher standard of living than in the past, and a higher standard of living requires the use of even more natural resources. A look at one country will provide a clear example of this fact. China is the world’s most populous nation, with 1.3 billion people. Currently, the standard of living for most of those people is far below that of people in first world nations. Therefore, the average Chinese citizen uses far fewer natural resources and less energy than the average citizen of the US or Japan. But China is growing in power, and more of its citizens are beginning to expect a first world lifestyle. If every Chinese person attains a first world lifestyle, the amount of energy and natural resources needed in the world will double, even if the standard of living in every other nation on Earth remains the same as it is today.

According to the passage, how does food production contribute to global warming?

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The guards were ordered to get to the king's room on the double.

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John is fat because he eats so many chips.

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Prevented the soil from erosion, the trees planted by the farmer many years before were what stopped the flood from reaching his house.

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The director retired early _______ ill health.

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The visual nerves of the brain interprets wave-lengths of light as perceptions of color.

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People say he won a lot of money on the lottery.

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During a period of expansion, a firm often requires an increased number of ______ to perform the additional labor.

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Next year, we're going on a cheap _____ holiday to Portugal. The flight and the hotel are included in the price.

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The boy _____ having had anything to do with the break-in.

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There is no alternative. The president must approve the bill if the Congress passes it

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She could ______ in the garden when we came around, which would explain why she didn’t hear the bell.

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Mathematics is such important field and serves so many of the sciences that it is a prerequisite for studying every scientific discipline.

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You should praise yourself for having achieved such a high score in the graduation exam.

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The machine has been out of order since last month.