This is an extremely common retort - the only solution is the Stone Age. That’s just an extremism in another form.
This is not about being perfect or going back to the stone age but progressively getting better. Lots of small actions can magnify and multiply, start “unblocking” the bigger problems, and accelerate the transition towards something that looks much better than what we have now.
If you are genuinely interested on the possible pathways for pretty much every challenge we face in this issue, there’s lots of good reading available:
10 Solutions for Climate Change
Climate Solutions
Global Warming Solutions
Managing Global Warming | ScienceDirect
Global Warming Solutions
This “all or nothing” nonsense is what Alan Jones, Andrew Bolt and all the usual suspects trot out to scare people and create a false choice.
All those thing have their own planet-impacting challenges, but nothing quite as immediate and of global-extinction potential as runaway CO2 emissions.
Of course, that’s how science works. And those contra set of figures are almost always shown to be wrong in some way, or based on poor or non-science, or irrelevant, and consequently debunked. But of course, that never stops them being trotting out again. Repeatedly.
Every issue you have raised so far has been explained and/or debunked many times. Do you seriously think that any of these issues that you, or any sceptic or denier have raised, have
never been thought about or assessed by scientists? Factored in if concluded to be relevant, and discarded if not?
Just because you haven’t attempted to inform yourself as to how we measure or estimate emissions from bushfires (the recent bushfire emissions
have already been estimated based on size of the area burnt and the density of trees, all of which can be accurately measured from satellite measurement and imagery), or volcanic emissions (the volume and duration of plumes can be measured, as can their chemical composition), or anything else you’ve mentioned, doesn’t mean it’s not possible.
https://www.global-greenhouse-warming.com/measuring-volcanic-emissions.html
Measuring Volcanic Emissions from Space
If you want to know how science measures these and other things, then start reading more, going to reputable scientific sites, and adopt a mindset of a willingness to learn.
As much as I might like doing the googling for you, at some point you need to take responsibility for seeking the answers to your own questions if you genuinely want to know about and understand this issue.