The other huge threat to the safety of our planet as a whole is the threat of nuclear war. Atomic bombs have become the most powerful form of a means of destruction and probably carries as much if not more threat as chemical and biological ammunitions. Of course, in line with the ethics of war, conventional means of weaponry are universally accepted, since one can control specific sites that are destroyed, and avoid civilian casualties. The threat of both nuclear and chemical and biological warfare is that the agents of destruction are not as controllable and will eminently kill innocent people who are not involved.
The following are internet sites that give some interesting insights into nuclear and conventional means of warfare:
Federation of American
Scientists: Nuclear Resources
The Nuclear
Bomb: Development, Implementation, Deployment, and Life After the Bomb