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The United Nations projects that the world population will reach 9.7 billion by 2050.

A) True
B) False

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Describe how global warming, the greenhouse effect, and greenhouse gases affect human lives.

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Global warming, the greenhouse effect, a...

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There is a growing consensus that human activity is causing global warming, or climate change.

A) True
B) False

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Describe key strategies for controlling energy use.

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There are several key strategies for con...

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Fluoridation is a water treatment process that reduces tooth decay by 5% to 40% and has been used successfully in the United States for more than 70 years.

A) True
B) False

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