Well, these issues are separate, and the solution is different depending.
If the climate change IS caused by human activity, we can change the outcome based on changing our activity. Furthermore, there are likely steps (Carbon sequestering, for instance) we can take to try to reverse the process. Furthermore, it's important that we do so, as the timeline for change is relatively rapid.
If the climate change is due to geologic shifts, we, as you said need to figure out how to adapt, and likely over a longer time-frame.
If it's both, then we will need to do both.
I haven't seen much research showing it's ONLY the latter, so it seems reasonable to act under the assumption it's the former. This does not preclude us from also preparing in the longer term as a species for the latter.
If the climate change IS caused by human activity, we can change the outcome based on changing our activity. Furthermore, there are likely steps (Carbon sequestering, for instance) we can take to try to reverse the process. Furthermore, it's important that we do so, as the timeline for change is relatively rapid.
If the climate change is due to geologic shifts, we, as you said need to figure out how to adapt, and likely over a longer time-frame.
If it's both, then we will need to do both.
I haven't seen much research showing it's ONLY the latter, so it seems reasonable to act under the assumption it's the former. This does not preclude us from also preparing in the longer term as a species for the latter.