Algae fuel is a biofuel from algae. Algae can produce more oil in an area the size of a two-car garage than a football field of soybeans. Algal fuel does not impact fresh water resources, and can use wastewater or even saltwater. With increasing oil prices, competing demands between foods and other biofuel sources and the food crisis, there is much interest in farming algae. (Bill Gates already invested, how about you ? ) The United States Department of Energy states that if algae fuel replaced all the petroleum fuel in the United States, it would require 15,000 square miles (40,000 square kilometers), which is a few thousand square miles larger than Maryland, or 1.3 Belgiums. This is less than 1/7th the area of corn harvested in the United States in 2000.