Several farmers settle on the banks of a river, which they use to irrigate their crops. After some time, the farmers discover that water from the river has become too polluted to use. Describe one way that the river may have been contaminated by the actions of the farmers, and explain how the farmers can remediate this problem.
A man who is concerned about conserving water decides to replace the incandescent lightbulbs in his home with energy-efficient compact fluorescent bulbs. Explain how this action can help the man conserve water. Describe one other product the man can use to help him conserve water.