Do you think the Third World War signifies the End Of The World?

That's possible. The nuclear weapons of the present is way too powerful than they should be. I heard the president/PM of russia or someother country has a box with him that contains a remote of a huge nuclear bomb planted somewhere. If he presses the button... Anyway, i was told that this box gets passed down from P to P. But none of them have used them yet.(Phew!) But i still think that once two superpowers start a war...that WOULD be the end of the world. I know many countries have nuclear weapons...and some are manufacturing them secretly. This could mean mass destruction! And the end of the world!