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Which of the following events happened first? Earth Day celebrated National Park Service formed World human population reached one billion The term "smog" used for the first time United States Clean Water
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Which of the following events happened first?

Earth Day celebrated

National Park Service formed

World human population reached one billion

The term "smog" used for the first time

United States Clean Water Act passed

User Brisi
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2 Answers

2 votes

The answer is world human population reached one billion.

User Jiri Vlasimsky
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4 votes
World human population reached one billion
User Fabian Kleiser
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