1. Energy Budget
Subtitle

3. All objects in the universe radiate some energy in all directions.
Hotter objects emit radiation that has a shorter wavelength and a higher energy.
Our sun emits infrared, visible, and ultraviolet energy mostly. However, stars that are much more hot emit X-rays and Gamma Rays.

4. Hotter objects emit radiation that has a shorter wavelength and a higher energy.
Our sun emits infrared, visible, and ultraviolet energy mostly. However, stars that are much more hot emit X-rays and Gamma Rays.

5. The sun emits mostly visible (43%), infrared (49%), and ultraviolet (7%).

6. What could happen to that radiation as it reaches Earth?
Reflected
amount in = amount out
Absorbed
and then latter radiated

7. What could happen to that radiation as it reaches Earth?
45% is absorbed, scattered, and reflected by the atmosphere.
4% is reflected by Earth's surface
51% is absorbed by Earth's surface, then reradiated as longer-wave, lower-energy) radiation back out into the atmosphere and space. This is what heats the Earth.

8. Earth's Energy Budget
As energy enters Earth's atmosphere, the same amount of energy leaves the atmosphere. This balance between incoming and outgoing energy is called the Earth's Energy Budget.

12. Let's Draw The Greenhouse Effect

13. Remember that energy coming in equals energy going out.
Without the greenhouse gases, Earth's temperature would be 0-degrees F.
Because of greenhouse gases, Earth's average temperature is 59-degrees F.
So is the greenhouse effect a good or bad thing?