Problem 1
Make a list of factors that are important in the ecological footprint of your community. How might these be changed in order to decrease the size of the footprint?
Problem 2
Why do so few people use a bicycle as their routine means of transportation, in spite of its mechanical efficiency and low cost?
Problem 3
How does your lifestyle contribute to pollution of your environment?
Problem 5
What are the major practices used to treat urban sewage? Why have some cities chosen to treat their sewage in an environmentally responsible way, while others have not?
