Currently three-quarters of Sun Tran’s fleet exclusively utilizes biodiesel fuel, which is a domestically produced, renewable fuel that can be manufactured from vegetable oils, animal fats or recycled restaurant greases.

Whether it’s adding solar panels or building LEED-certified buildings, agencies are finding ways to be environmentally friendly beyond purchasing alternative-fueled vehicles. METRO takes a look at agencies leading the charge.

Title: GM Organization: Sun Tran/Sun Van City: Tucson, Ariz.

The $196 million, 3.9-mile streetcar system, which is slated to begin construction this year, will connect major activity centers, including the University of Arizona and Downtown Tucson. The project is expected to trigger job development, spur economic growth and encourage transit-oriented development.