Would the role of the sun play a greater or a lesser roll than human activity. Simple yes or no. Thanks.
As it is currently understood, one day the sun will puff up to be a red giant and fry our lovely planet.
So long term, the sun will win.
On shorter terms, there have been coronal mass ejections that have blasted Earth with a few gigatons of solar "atmosphere", like the
Carrington Event. Something close to this
happened in 2012 and missed us by 8-10 days.
So shorter term, the sun will knock civilization for a loop.
At present, we can't do much about both of these things.
Regardless, I still like the concept of
primum non nocere.