Of course I meant liquid fuels of the kind that can be burned in internal combustion engines.

As one article I read mentioned, nuclear power only pollutes the environment if something goes drastically wrong. Coal pollutes the environment during day in, day out normal operation.

Coal waste includes not only what gets belched into the atmosphere by coal burning (even some radiation), but the waste associated with the burnt ash, the mining processes, and the means of transporting the coal around. It takes a lot more truck and train fuel to haul the tons of coal that are needed to generate the power that a thousand pounds of uranium can.

Natural gas falls somewhere between. It's a lot cleaner. There are "mining" problems, particularly with the fracturing process, but nothing close to what coal mining generates. It can be transported by pipeline, but needs special ships for some transports.