![]() Over much of the past century, the US was the largest greenhouse gas emitter because of high levels of affluence and energy consumption. Because the demand for resources like energy is often greater in wealthy, developed nations like the US, this means that countries with smaller populations can actually have a greater overall environmental impact. However, the energy consumption per person in the US is six times larger than that of a person in China, and 15 times that of a person in India. For example, the populations of China and India are roughly 1.32 and 1.14 billion people, respectively - about four times that of the US. Affluence, or the wealth per person, and the social norms of consumption are also important. The population story is more complex, however, because there is not a simple relationship between the number of people and the amount of resources consumed.
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