1. GREENHOUSE EFFECT Climate Change

3. Greenhouse Effect Is a natural process that permits the Earth to retain some of the heat from the sun. Gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane) trap energy from the sun.

4. Without Gases Without these gases, heat would escape back into space and Earth’s average temperature would be about -18 °C. Because of how they warm our world, these gases are referred to as greenhouse gases.

5. Energy from the Sun passes through the atmosphere. Some Infrared rays are absorbed, then emitted back to the atmosphere. The greenhouse gases capture these rays and return them to the earth.

7. A portion of the energy (26%) is reflected or scattered back to space. About 19% of the energy available is absorbed by clouds, gases like ozone. The remaining 55% of the energy passing through the Earth's atmosphere, 4% is reflected from the surface back to space. On average, about 51% of the Sun's radiation reaches the surface.

8. This energy is then used in a number of processes, including the heating of the ground surface; the melting of ice and snow and the evaporation of water; and plant photosynthesis.

9. Human Activity How are we changing the greenhouse effect?

10. Normally most of the CO 2 came from Forest Fires, Volcanic Eruptions and Cellular Respiration Now the increase of fossil fuels and the clear cutting of Forests is shifting the balance of the CO 2 present in the atmosphere

12. Greenhouse Demo Graph