JUST THE TIP OF THE ELEPHANT'S TAIL
Texaco Inc. uses this drawing of an elephant to depict predicted hydrocarbon emission from various sources for Dallas in 1995 after the Clean Air Act amendments of 1990 are in effect. It also shows the potential reduction in emissions due to severely reformulated gasoline. Emission sources consist of biogenic, which account for 25% of total emissions, and man made, which supply the rest. The latter category breaks out into stationary sources 50%, mobile exhaust 10%, and mobile evaporative 15%.