: not combined with anything : cost-free from almost everything That may make filthy, modify, or decrease the quality one. How is biomass different from fossil fuels? Biomass can be a renewable energy resource derived from organic and natural resources like plants and squander, which can be replenished fairly immediately. https://purebiofuelwoodpelletscan63938.popup-blog.com/37199284/indicators-on-biofuel-burner-you-should-know