There are nuclear weapons in China Iran Korea and Pakistan. It wouldn't take much to send a couple of warheads off on this planet somewhere that would cause a lot of environmental damage then if you have got someone who wants to retaliate you have real problems.
Until 1914 I loved to travel I often went to Italy and once spent a few months in India. Since then I have almost entirely abandoned travelling and I have not been outside of Switzerland for over ten years.
