Compare and contrast the effects of ozone in the stratosphere and troposphere.
What will be an ideal response?
Both are formed by atmospheric oxygen (O2) combining with an atom of singlet oxygen (O). In the troposphere, ozone is a major component of smog. It is formed as a photochemical oxidant, resulting mainly from too many hydrocarbons in the air. It is a strong oxidizing agent and damages vegetation and buildings. It is also an irritant to the lungs and eyes. It can be very harmful to persons with underlying respiratory conditions, so it is considered a pollutant. Its role in the stratosphere is completely different. It acts as a UV filter, providing earth with a "natural" shield from incoming solar radiation. When it becomes depleted, due mainly to CFCs, excess UV makes it through the ozone layer. This results in increased incidence of skin cancer and eye damage in humans. It is also harmful to crops, which may show decreased productivity.
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What is the importance of fire in ecosystem management? What is the cost of fire suppression for ecosystem health? What is the alternative to fire suppression?
What will be an ideal response?