I'm not sure it's even a binary choice between 'natural' and 'manmade'. my emphasis is more is it cyclic or not.
all human beings suffer from the same lack of perspective when it comes to the potential of the existence of cycles that transcend the length of time periods we are used to tracking and therefore, comprehending.
thus are the climate alarmists correctly interpreting us as being near the end of one single trajectory, OR, are we somewhere in the middle of the first of a million cycles?
Answer: we have no idea, but a generation 100 removed might....