. >> because wilson's reactor is using motelen salt, and it is sealed, you can train the contents.nto a tank where nuclear tanks can't take place. in no situation properly engineered should it release radioactivy. government gave half a billion to companies developing similar technology. wilson believes his design is behind the market in five years. nuclear power has a lot of innovation. if we can go forward, saving lives is saving the planet using nuclear energy. that, in a way you could redeem it. they deserve that. >> reporter: for many, nuclear energy remains beyond. what do you say to the activists who may have changing their time. >> they are sell outs without question. >> without question. >> when we produce something that is so toxic and lethal as nuclear waste. it's a foul deed against our living mother earth, and it's wrong. >> one critic told us directly those who changed their mind about nuclear energy, what would you say to that person. >> i said i'm trying to do the same thing, trying to create a world where all live. we live in a world where there's risks in a world