This is still a far cry from a global nuclear winter or a deliberately redirected asteroid, or any other number of things that only humans are capable of.
The Great Oxigenation Event is a terraforming level event. We are not yet capable of such a large scale manipulation. Nuclear winter is at most comparable to a supervolcano or an asteroid impact.
Also, if you consider asteroids to be natural and their orbits to be natural then "nature" is already plenty capable of playing cosmic billiards. Or do you want to restrict nature to just biology?
Also, if you consider asteroids to be natural and their orbits to be natural then "nature" is already plenty capable of playing cosmic billiards. Or do you want to restrict nature to just biology?