One definition of biomass is biological activity that we can convert into energy. Many potential, renewable sources of biomass energy exist in Pennsylvania, especially on farms. This video profiles various facilities that make biomass energy. One facility in Pennsylvania converts wood to steam to generate electricity. Another company harvests forests selectively so as not to deplete its resources. The turnpike commission is fueling trucks with biodiesel made from soybean oil. Another company is supplementing natural gas with landfill gas created through heat and compaction with some bacteria. Still another company offers a furnace that runs on renewable grains, like corn.