(Source: U.S. Environmental Protection Agency. Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990 –2007)
The major part of these petroleum products are consumed by vehicles. With the encouraged use of electric/hybrid vehicles, and increasing convenient charging stations, this number can be reduced in future. Transportation sector also takes up 25% of greenhouse gases emission every year. The efficient applications of renewable energy in transportation system will reduce the emission of CO2 and other pollutants. This not only protects air quality and water resource, but also benefits people’s health and contributes to sustainable development of our society.