I found an eco-friendly tiki torch oil made from vegetable oil, so it is renewable and it burns clean. And I can get bamboo tiki torches (which are renewable). I'm so excited! Now I can have "natural" lighting without sacrificing my eco-friendly theme. Granted, I'm sure it is less eco-friendly than solar lights, but I can get bamboo tiki torches in town, which minimizes gas consumption (which is eco-friendly).