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Examine the figure below.
The amount of carbon dioxide in Earth's atmosphere has been increasing over the past 50 years because of:
Eastern Europe
A region that encompasses many countries to the east of Germany and west of the Ural Mountains, known for its rich history and cultural diversity.
Soviet Union
A former federal socialist state in Eastern Europe and Northern Asia, existing from 1922 to 1991, officially known as the Union of Soviet Socialist Republics (USSR).
Free Market Reforms
Changes in economic policy aimed at reducing government intervention to allow for a more autonomous operation of the market and competition.
Defense of Marriage Act
A U.S. federal law enacted in 1996, defining marriage for federal purposes as the union of one man and one woman, and allowing states to refuse to recognize same-sex marriages granted under the laws of other states. It was partially struck down by the Supreme Court in 2013.
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