If that's the best technical argument the detractors have, that says quite a lot about their arguing position.

I'm surprised, jerf, to see this kind of comment coming from you (as I take care to follow your comments on HN). If investors are only interested in a technology after the government lavishes your tax dollars and mine on developing it, to me the technology is surely less promising than a technology that develops mostly through private investment. People spending their own money usually does better at identifying technologies with a large upside than efforts to get government backing for this or that "strategic" or "breakthrough" technology.

The current way that objections to nuclear power from the uranium cycle (the kind of power I enjoy here as I type this) are usually dealt with is try any and every technology other than nuclear power. I agree with the statements in this thread that "nuclear" by itself isn't a label that indicates that the power source is bad, but I point out that private investors seem to be seeking to invest in a lot of other kinds of power sources more than they are seeking to invest in thorium.

AFTER EDIT: I spent a while just now searching for a linkable version of the special report on the world natural gas market published in The Economist a few months ago. (I don't know what prompted the downvote that came while I was doing that.) I haven't found a link yet, but I have to recommend that special report section of the print edition of The Economist to anyone who hasn't had a chance to read it yet.

The statement from my top-level comment above that I'm being asked to defend is "I'm not aware of any part of the world where local politics would make a thorium plant more likely than another wind power plant or natural-gas-fired power plant. So maybe thorium power generation is a technical solution looking for a problem." But I'll come right back at anyone who claims that thorium power has a big future by asking, do you have a solid estimate how much it will cost to produce electricity with thorium, considering the entire technological process from mining to by-product disposal? The production of natural gas by "fracking" is revolutionizing the world energy economy

http://www.economist.com/news/briefing/21569037-why-worlds-m...

http://www.economist.com/news/briefing/21569039-europes-ener...

and has probably given the development of renewable energy sources two extra decades to become economically competitive. That's enough. Green energy development is a necessity around the world,

http://www.economist.com/node/21556904

and all the other modalities will be researched and receive further commercial development. By the time thorium power could come on line, you and I and everybody will have renewable energy at competitive cost, with natural gas having bridged the transition.

AFTER SECOND EDIT: Thanks for your reply, jerf, which was posted as I was writing my first edit. Every which kind of power generation, as the references I've just added to this comment make clear, is developing in a market distorted by tax-funded subsidies. Better to let purer market forces sort out the trade-offs among different energy sources. I was just reminded that pg, our site founder, has been following this industry for a long time.

http://www.paulgraham.com/ladder.html

"After all, projects within big companies were always getting cancelled as a result of arbitrary decisions from higher up. My father's entire industry (breeder reactors) disappeared that way."

My comment is that any Baby Boomer who read about physics as a kid (like me) heard about thorium DECADES ago, and has heard thorium repeatedly mentioned as the energy source of the future, a future that never comes. Paul Graham's dad worked for one company in the power industry, and my late dad the industrial engineer worked for another company in the industry, manufacturing electric generators for power plants. The power sources that spin electric generators were always dinner table conversation in my home when I was growing up. I think thorium is a very interesting fissile element, but my person guess about future power development is that there will never be a thorium power plant in Japan, in Germany, in the United States, or even in nuclear-plant-friendly France.