Nuclear-Free Zones nearly cover the world

I think I might have covered this petition before but wanted to highlight it again - if you agree with millions of others that the government should scrap plans to spend in excess of £76bn on replacing Trident with a new generation of nuclear weapons then please join the Rethink Trident movement and join me in signing this petition:
http://action.compassonline.org.uk/page/s/stoptrident

Interestingly combined with treaties prohibiting the placement of nuclear weapons in outer space and the Antarctic, much of the world is now covered by one of five existing nuclear weapons-free zones (NWFZ).

NWFZs have been established through multilateral treaties in regions such as Latin America, the South Pacific, Southeast Asia and since July, Africa - they play an important element in the nuclear non-proliferation regime. It is a great pity the UK can't also join.