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Global warming quiz1. Air consists mainly of:less than 0.1%25, 0.1%25 to 1%25, 1%25 to 2%25, more than 2%25, 2. The greenhouse effect is the same thing as global warming. about 5 °C, about -3 °C, about 15 °C online , about 23 °C, 3. Carbon dioxide forms # of the Earth%27s atmosphere. True, False, , 4. What is the most common greenhouse gas emitted from human activities? nitrogen, oxygen, carbon dioxide, methane, |