Yup that would do it
Posted some ideas last year about this.
Also relevant, the "Oh-My-God!" particle detected recently had about as much energy as a baseball moving at 25mph so imagine two of those hitting head on.
Then realize that this happens probably ten times a second (!) at the center of every Galaxy and this has been going on for close to 9B years and we are all still here.
On the other hand, Ebola is much MUCH more likely to cause human extinction and the world's attention should be focused on dealing with this threat and not petty squabbling over resources.
10% of the money to be spent on Trident's replacement ought to nip it in the bud, and Cameron would be nominated for next years Peace Nobel.