Environmentally Friendly (zero carbon footprint), No air pollution or petroleum product vapour from the product in dormant or function usage scenarios. Double �burning time�. No �residue� or �remains� left by-product other that what would naturally be found (Ash only). No residual chemicals when handling. Non-toxic Child Friendly and Pet Friendly Natural bug repellent � coffee beans have natural bug repellent qualities to it which makes the FireFly Biofuel great for camping too! No chemicals to dry out � (the dryer the better) 75% recycled products, the rest is made from sustainable sources