I have a market argument against thorium reactors - basically, if they were as awesome as their proponents argue, then someone would have built one by now, for

I have a market argument against thorium reactors - basically, if they were as awesome as their proponents argue, then someone would have built one by now, for commercial purposes. But there hasn't ever been a commercial thorium reactor, and there hasn't been a serious build since the 1960s. Fifty years, and a lot of countries that aren't full of namby-pamby treehuggers to blame for it. Even India, which is sitting on like a third of the world's thorium reserves, doesn't build them. This makes me rather suspect that thorium isn't nearly as awesome as its proponents think it is.