I would just add, very briefly, that I was encouraged by your point that you do not support the proliferation of nuclear weapons, and so that's the challenge we hold in common. How do we make good on that concern?
We can't turn the clock back, but we can control the science. We can control the technology. And in fact, the record has been of fairly effective control of the technology. The breakout of technology to new regimes is very limited. The International Atomic Energy Agency is there and controls the technology and the science on a daily basis. It needs to be strengthened. It needs to be further reported.
I think one thing we can say is that we will never reach a point where the nuclear problem has been solved and now we'll go on to other things. There will always be temptations for somebody to pick up the science. They will have to be vigilant at all times. The institutional arrangements through the International Atomic Energy Agency to prevent proliferation will always be necessary and present and will require the energetic diplomatic support of countries like Canada.