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Read the following scenario and answer the questions below.
Meanwhile, the United States, a country that emits one-fifth of Earth's greenhouse gases, failed to even ratify the Kyoto Protocol. In its place there were revisions to the 1970 Clean Air Act, called the "Clear Skies Initiative," which limits emissions of mercury, nitric oxides, and sulphur oxides from power plants. Nicknamed by Robert F. Kennedy, Jr., as the "Clear Lies Initiative," this proposal did not specifically address emission of carbon dioxide, and did not impose targets on main fossil fuel industries with a lot of political influence: the petroleum, coal, and automobile companies. Environmentalists are arguing for immediate action, including stricter laws to limit power plant carbon dioxide emissions and subsidies for renewable energy. They favour "portfolio standards," requiring electric companies (which produce most of the greenhouse gases in the United States) to provide clean energy alternatives to consumers and "green tags," "wind certificates," and "green pricing" to support the use of alternative fuels.
The United States should enact laws slowing global climate change because ________.
A) it is the most populous nation on Earth
B) its industry supports the legislation
C) it is the major source of the problem
D) global climate change effects are most significant there
E) no other nations have initiated efforts to slow global climate change

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