In my opinion, the BAS report would be more useful if it focused on the threat of global thermonuclear war, and left other issues such as global warming for their own separate reports.
The BAS report should have explained in detail what would happen in the event of nuclear war, using some best case and worst case scenarios. This site contains some information along those lines. One scenario shows how even a "limited" war between India and Pakistan could have devastating consequences for the entire world.
http://www.nucleardarkness.org/index2.php
I think a more quantitative approach to this topic is a good idea. Perhaps we could come up with something like Drake's equation, only instead of predicting the chance of life on another planet, it would predict the chance of a nuclear war. Then perhaps we could use this equation to guide us towards a situation of less danger.
We could start with the number of warheads stockpiled by each nuclear power, and the destructive power of each of these warheads. This article indicates the number of warheads.
http://www.independent.co.uk/news/w...tries-that-have-nuclear-weapons-a6798756.html
If we move on to such factors as the level of armed conflict, the status of ongoing nuclear disarmament talks, the level of militarism or aggressiveness in a particular state, and how often a state violates international law, then we run into an area where there are conflicting opinions. It seems difficult or even impossible to come up with a metric we could agree on.
On second thought, let's keep it simple. We need to get rid of all the nuclear weapons. We know what can happen if we fail to do so.
The BAS report closes with the recommendation for wise citizens to take the lead on this issue if the world leaders don't do a good job. Just how would these wise citizens take the lead?
What gives me some hope is that if the USA and Russia could get together on this issue, agree on a program for total nuclear disarmament, and guide (or force) the rest of the world to comply, then we could work this out. This problem is man-made and it can be solved by man. I agree with the saying from Terminator 2: "no fate but what we make."