What purpose? Energy for the home? Energy for a car? Energy for a ship at sea? Energy for your phone?
These are all different applications with different storage and safety parameters.
For example, a methane fuel cell might be a pretty good way to power your phone in a few years. There are new discoveries of catalysts that can even outperform platinum, they don't seem to have the same problems with cell poisoning, and they cost a fraction of what platinum cells cost.
But what works adequately for your phone may not scale up all that well. Accidental release of an ampule of methane probably isn't particularly hazardous in most places, but releasing a tank-load from your back-yard might be a serious problem.
Likewise, thorium fission processes are interesting, but it may not be practical or safe to scale down to an acceptable level that could be used in a car.
First figure out what the problem is, as Vanadium 50 pointed out, and then try to find a better solution. That's what scientists and engineers do for a living. Don't fall into the trap of being a political solution provider looking for a problem. Most people can see that kind of nonsense from a long way off. You're not likely to get far by pretending to be an environmentalist engineer. Be an environmental engineer instead.