Since we are on the subject of nuclear weapons:
Consequences of using modern nuclear weapons can be far more serious than previously imagined. The military seem to ignore the fact that a neutron radiation is capable to reach significant depths in the planetary interior.
In the process of passing through the planet and losing its intensity, a neutron beam stimulates nuclei of radioactive isotopes naturally present inside the planet to disintegrate. This disintegration in turn, generates more neutron and other radiation. The entire process causes increased nuclear heat generation in the planetary interior, far greater than the initial energy of the bomb.
I urge you all to read the short but informative article at http://sci-e-research.com/neutron_bomb.html and forward it to people who has a chance to understand.