Zero carbon emissions? The uranium drag line, trucks, ships, trains, and smelters are all fossil fuel powered, and that doesn't include the prodigious amounts of steel and cement needed for a nuclear plant. It might be less carbon-intensive than, say, oil, but it's certainly nowhere near zero.

LFTR reactors, if they actually had significant economic potential, wouldn't need incentives. India or China would have gone all-out on them, but the fact is they still require Uranium to get started, and even in theory they aren't much better than what we're currently using for fission-based power.

Ignoring both coal and nuclear is pretty much inevitable, as long as natural gas and renewables stay this cheap or cheaper.