It's all just evolution - improving the breed. Drones will control the sky, robots will handle the ground warfare. People won't need to be involved. We'll just move the borders after one side declares victory.
Unless, of course, you consider the humans killed by those drones and robots as people.
Veritas Vacuo, your stupidity and trolling is becoming highly annoying. Why don't you go back to your darkened basement before you soil yourself in fear? Feel free to cuss out those darned scientists who research stuff you don't like, instead of spending their efforts in maximizing the comfort of your nest like they should.
The deuterium-helium three fusion reaction (D +
3He →
4He + p + 18.35 MeV) is relatively easy to achieve, but limited by the availability of
3He. It is not as easy to achieve as deuterium-tritium fusion (
2H +
3H →
4He + n + 17.58 MeV), but there is much less neutron radiation (about a quarter compared to deuterium-tritium fusion at the same energy output; and that due to unavoidable deuterium-deuterium fusion,
2H +
2H →
3He + n + 3.27 MeV, in the conditions where deuterium-helium three fusion occurs).
Deuterium is relatively abundant in the oceans, and isn't expensive to extract.
3He is rare. It is estimated that you need about 20g of
3He per gigawatt-hour of energy produced, in a practical fusion reactor.
The main problem currently is the fragility of our current materials in such a high-energy environment. High-energy charged particles (electrons, protons) escaping from confinement and impacting the container walls is a real practical problem: stainless steel, for example, becomes horribly brittle very fast. Neutrons are even harder to handle, because they cannot be contained by magnetic fields; and good neutron absorbers we have erode too fast by those high-energy charged particles.
Completely sealed miniature fission reactors (say, the size of a shipping container) are
trivial in comparison.