Thorium and uranium?

"The difference in the state of development of thorium versus other sources of fuel is so vast and the cost of developing the technology is so high, it's really questionable today whether it's worthwhile to spend a lot of money on the development of thorium."

One possible exception that may make thorium more promising is its abundance. The world's thorium supply is estimated to be several times greater than that of uranium. If the world continues to use existing "open" reactor designs, which only use a small portion of the uranium fuel that passes through a reactor before being discarded as waste, then fuel scarcity could become an issue.¨[8]

The thorium can be used as an alternative fuel to uranium in light water reactors, the most common technology for nuclear power plants. [9]

References

1. https://en.wikipedia.org

2. https://en.wikipedia.org/wiki/Thorium

3. http://energyfromthorium.com/energy-independence-and-sustainability/

4. http://www.caradvice.com.au/132921/the-thorium-powered-car-eight-grams-one-million-miles/

5. http://energyfromthorium.com/about/

6. http://www.thoriumenergyalliance.com/ThoriumSite/resources.html

7. https://whchronicle.com/?p=2953

8. http://www.popularmechanics.com/science/energy/a11907/is-the-superfuel-thorium-riskier-than-we-thought-14821644/