Is greenhouse effect beneficial and/or harmful?

Which of the following statements about the greenhouse effect is false?

• A. A runaway greenhouse effect can drastically increase the surface temperature of a planet. B. Without the naturally occurring greenhouse effect, the surface of the Earth would be much colder, and LA wouldn't have the balmy temperatures we enjoy. C. The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide. D. The ozone layer is responsible for the greenhouse effect on the Earth . E. A strong greenhouse effect operates on Venus, so its surface is a lot hotter than it would otherwise be.

• Answer:

  The correct answer is D. The ozone layer, comprised of molecules that have 3 oxygen atoms (instead of the standard 2) actually reflects radiation back into space, specifically the more dangerous Ultraviolet rays, X-rays, and Cosmic/Gamma rays.