It is funny, nuclear power gets such a bad reputation among environmentalists, but if you actually look at it, it has been our safest, most realistic and most environmentally-friendly option for generating power in the world. The reason people irrationally call nuclear power bad is because of the two catastrophes that happened (Chernobyl and Fukushima) and because they think nuclear = nukes = bad. Chernobyl is a bad example because the facility wasn't very high quality, and Fukushima happened because of a tsunami, not because nuclear power is unsafe. Hopefully this view will start to change.
Chernobyl was like the worst nuclear plant ever devised. If i remember right, it didn't even have a protective concrete casing around it.
The environmentalists in the move had been antinuclear for their entire careers until they looked into energy sources more. Even solar is worse than nuclear because of all the toxic materials used in making solar panels. It's pretty surprising.
Thorium plants are probably the future, safer, cleaner and thorium is pretty abundant. Both India and China are working on them now. The US actually made one decades ago, but it was scrapped as its a poor source of fuel for nuclear weapons.
As for nuclear = nukes = bad, something I didn't know until after I watched the movie -- many existing nuclear plants are using nuclear material from warheads that we got from Russia. So basically nuclear power is eating nuclear bombs up... safer than having them pointed at us.