### Define negative relationshp between gross domestic product

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1) Compute the discount factor 1/(1+r)^t for r=1, 5, or 10 perent interest rates and t=30 and 50 years. remember that 1 percent is .01. based on your computation, is teh choice of discount factor important for deciding whether to do somehtinga bout global warming today? why or why not?

2) (a) why might there be a negative relationshp between gross domestic product (GDP) and environmental quality for a country? why might there be a positive relationship between GDP and environmental quality?

(b) do you expect all pollutants for one coutnry to have the same shape of the environmental kuznets curve? if so, what shpae do you expect? if not, does the EKC always imply that a country can grow its way out of polluting?

(c) if increased GNP is associated with miproved environmental quality, does this relationship mean that a cleaner environment comes at no cost - acutally at postivie benefit - to GNP? if so, why is environmental regulation so often opposed? if not, what explanation exists for this relationship?

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