Multiple choice question - choose single answer

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Read the text and answer the multiple-choice question by selecting the correct response. Only one response is correct.
World Economy
About a billion people - one-sixth of the world's population live in the developed countries of the market economy. Those affluent societies account for more than 75% of the world's energy and resource consumption and create the bulk of industrial, toxic, and consumer waste. The developed economies thus leave large ecological footprints. Despite such intense use of energy and materials, however, levels of pollution are relatively low in the developed economies. Why? Three factors account for this seeming paradox; stringent environmental regulations, the greening of industry, and the relocation of the most polluting activities to the emerging economies.
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