More than three-dozen geothermal wells can be found in Manhattan, heating some homes, schools and commercial spaces more efficiently.

Millstone Farm in Wilton, Conn. produces food in a sustainable way, raising bees to increase food production instead of fertilizer and using a bio-diesel furnace for heating.

About 300 municipal garbage trucks in Los Angeles are running on natural gas, releasing 90 percent fewer greenhouse gases into the air and saving the city close to $1.5 million in fuel costs in the past year.