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An earthquake
Preventing other countries with nuclear munitions from using them (nuclear deterrence, mutual assured destruction). Or, obviously, to end the world
No, excepting of course some important accidents.
No. If there is a disaster in a nuclear plant - and those DO happen now and then - this can affect populations hundreds, or even thousands, of kilometers from the power plant.
Japans disaster this year 2011 effected the water because during the earthquake nuclear reactors that create nuclear power were damaged and they released radiation and high amounts of radiation in water and the air can potentially kill people if there is too much radiation taken in
Very unlikely. Also neither were nuclear explosions:Chernobyl was a massive steam explosion in the cooling system, and Japan was a combination of steam explosions and maybe hydrogen/oxygen explosions. The nuclear releases in both cases were due to breaches of the containment by these explosions. If they had been nuclear explosions many miles from the plants would have been leveled and that did not happen.
In the vast majority of nuclear plants there is no effect whatever apart from the need for cooling water. Only in rare disasters like Chernobyl (1986, Ukraine) is there significant release of radioactivity. This can affect people in the neighbourhood directly, or it can through spreading out affect a wide area making food produced in that area contaminated. This has never happened in the US or western Europe.
How did nuclear warfare affect the cold war?
Affect? Affect? Not affect- disaster!
well depends on the extent of the disaster that has occured. Countries that mainly inport food are generally better off than countries that don't e.g. crops may get destroyed.
me
various disaster like