What is radiative forcing?

2.Even if western states had particle aerosol levels similar to those in the east, visibility reduction would be less. Why?

3.What pollutant has the greatest impact on radiative forcing? Why?

4. Significant changes in visibility have occurred in the eastern part of the U.S. in the past half-century. Describe their cause.

5. Describe the radiative effectiveness of CFCs, CH4, N2O, and tropospheric O3 relative to CO2.

6. What is a heat island? What is its environmental significance?

7. Describe two direct effects of stratospheric O3 depletion.

8.Though global surface temperatures have increased, the lower stratosphere has cooled. Why?

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