Which of the following factors should be considered when estimating the ecological footprint of urban areas?
A. the population density of the urban area
B. the amount of waste generated by the urban population
C. the affluence of the urban population
D. the amount of undeveloped land outside the urban boundary needed to supply ecological services to the urban population
E. All of the above should be considered.
Answer: E. All of the above should be considered.
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