First of all, here is some background about this problem. Global warming is a general topic on the Earth, and it is also one of the main causes for the water shortage in California. As global warming makes the water in reservoirs evaporate, California keeps losing water. It then causes the water shortage. Besides, according to the Jonathan Foley’s speech in TED talk, some parts of Colorado River have been dried up when the other states in the United States of America keep using a large amount of water from the Colorado River. For instance, the farmers in Arizona grow lettuce in the middle of the dessert, and the administrators of the golf courses use a lot of water from the Colorado River to irrigate the golf courses' lands (Foley, 2010). As
