Eco-fuels is a new company developing bio-fuel technologies, including a bio-fuel powered hot air balloon. Bio-fuels can be produced from plants and algae, and are split into types like bio-diesel and bio-ethanol. Bio-fuels release carbon dioxide rather than greenhouse gases when burned, and can be used as fuel for vehicles, to clean oil spills, and generate electricity. While the bio-fuel balloon is off to a slow start, the company expects sales to increase as they begin offering rides.