Which of the Following Would Have the Greatest Influence in Creating

Which of the following would have the greatest influence in creating a more sustainable urbansociety?

A) improving the efficiency of water filtration systems in order to decrease our consumption of freshwater
B) increasing fuel efficiency in our vehicles so we can decrease the consumption of fossil fuels
C) decreasing the amount of environmental pollution produced by industry
D) decreasing the amount of land that is altered in order to accommodate human desires (new homes, factories, agriculture, etc.)
E) exploring alternative energy sources that are more environmentally favorable (i.e., solar, hydropower, etc.)