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How is carbon dioxide released into the atmosphere?

  1. Carbon stored in soil and rocks

  2. Condensation of water vapor

  3. Evaporation of surface water

  4. Fossil fuels burned for energy

The correct answer is: Fossil fuels burned for energy

Carbon dioxide is released into the atmosphere from the burning of fossil fuels for energy, such as coal, oil, and natural gas. Options A, B, and C are all natural processes that do not release significant amounts of carbon dioxide into the atmosphere. Therefore, they are incorrect answers.