"They also burn a fossil fuel, which is more detrimental to the environment than low-power LEDs" True however the true cleverness was that they burn the fumes

"They also burn a fossil fuel, which is more detrimental to the environment than low-power LEDs" True however the true cleverness was that they burn the fumes coming off the sewerage system safely disposing of formally dangerous build ups of the gas while getting brighter at the same time. So essentially fossil fuel is only a part of what they burn.