"There is no doubt on the basic science, but there are scientific uncertainties, too." Future changes in science and technology alongside the increasing energy consumption of India and China also make projecting environmental impact difficult.
Every person on the planet is responsible for an average of one ton of carbon emissions per year. Breaking that number down by region presents a different picture. Per person, Americans are responsible for 6 tons on average, Europeans 2.3 tons, and Indians 0.3 tons. Guesnerie said that because the United States has kept energy prices low compared to Europe, Americans are accustomed to products and practices with greater environmental impact. But that also means that there is much room for improvement.
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