Good grief.
Only a fool would imagine that climate/temperature are only affected by atmospheric CO2 levels.
Of course there are many variables that exert effects.
It’s appropriate to try and understand it the best we can, and to put forth reasonable theories, test them, and argue about what is valid. And to expect our understanding to evolve over time.
Now, if the climate is changing in a way that is problematic (seems to be) and if we are contributing to that change (seems likely we are), even if there are other variables we are not responsible for influencing, it seems prudent to consider adjusting our influences in a way that would be expected to mitigate the undesirable change. Especially if the benefits of proposed changes extend beyond influences on temperature.
Of course there’s always some degree uncertainty.