Multiple choice

How have humans affected the composition of Earth's atmosphere?

  1. They have polluted it with carbon dioxide gas.

  2. They have polluted it with excess ozone.

  3. They have made the atmospheric temperature drop.

  4. They have made the atmospheric pressure drop.
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A Correct answer
Explanation

Human activities, particularly the burning of fossil fuels and deforestation, have significantly increased the concentration of greenhouse gases in the atmosphere. The most notable of these gases is carbon dioxide.

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