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Main Global Warming1. What is the Earth%27s average temperature?carbon dioxide, nitrous oxide, nitrogen, tetrafluoromethane, 2. Air consists mainly of: about 5 °C, about -3 °C distant learning , about 15 °C, about 23 °C, 3. # is the most common greenhouse gas emitted from human activities. TRUE, FALSE, , 4. The greenhouse effect is the same thing as global warming. nitrogen, oxygen, carbon dioxide, methane, 5. How much carbon dioxide is in Earth’s atmosphere today? 20%25 or greater, 10%25 to 20%25, 1%25 to 10%25, less than 1%25, |