2. Why does the graph have a separate area for Pb?
3. According to the graph, which of the pollutants was emitted most in 1997? Which was emitted
least?
4. How many million tons of CO were emitted in 1970? in 1997?
5. Based on the graph, would you say that the amount of the six pollutants emitted is decreasing or
increasing? Why do you think this could be the case?
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