In which two ways does the fourth paragraph contribute to the development of ideas in the passage? Many vegetarian supporters would say the best thing you can do for the environment is to stop eating meat. Some estimates show that the amount of water used just for farming equals the amount of water used for everything else in the United States combined. Supporters say it takes 2,500 gallons of water to produce a single pound of beef. This is equivalent to taking a long shower every day for two-and-a-half weeks. The fertilizer used to grow crops that feed animals has also been identified by the Environmental Protection Agency as a major water pollutant.