I think the Global Priorities Project [1] has that covered - at least to first order. "Definition: Global Catastrophic Risk – risk of events or processes that

I think the Global Priorities Project [1] has that covered - at least to first order. "Definition: Global Catastrophic Risk – risk of events or processes that would lead to the deaths of approximately a tenth of the world’s population, or have a comparable impact." [1]: http://globalprioritiesproject.org/ http://globalprioritiesproject.org/