Biodiesel from waste products won't solve the U.S. dependency on oil. The U.S. generates about 2.7 billion pounds of waste vegetable grease a year. If all of it were harvested and converted to biodiesel, it would produce about 350 million gallons of fuel. If half of the inedible tallow and animal fat from slaughterhouses were harvested, another 500 million gallons would be produced, according to figures from Eidman. The U.S., however, consumed an estimated 62 billion gallons of diesel last year, so these contributions would amount to about 1 percent.