Orlov dismisses Thorium reactors, fusion energy, etc. right at the start, thus starting off on false premises. He is also very casual about nuclear waste disposal, which is going to be the death of the planet. There is no way of safely disposing the waste (half-life of millions (billions?) of years), so they are getting rid of some of it by firing it in the form of DU at enemies. Most of it is sitting around in pools waiting for an earthquake to release it.