In what way does it solve anything? At that point we built a huge Rube Goldberg machine that burns coal for X energy, spends 2X energy on getting back the carbon (it’s simple entropy), producing that offset from nuclear and renewables.. it may be fun as an art installation somewhere, but to play with this bullshit at the scale of our planet is just ridiculous.
Also, in and of itself life is 100% carbon neutral, or actually carbon decreasing as it is not 100% efficient - that small inefficiency is basically how we got many of our current oil/coal reserves. Biology did fix a big “mistake” of it, and since a few million years ago even trees can be properly “burnt” by fungi, so only some carbon is actually lost due to some extreme conditions (like it fall into whatever that embalmed it for a long time).
The problem is that we reintroduce all these lost efficiency buffers in a few years that is such a fast paced change that it has dire consequences.
Also, the reason for carbon in case of life is energy and a fundamental temporary constituent of the very thing. We do use carbon for many things, but the energy part can be entirely replaced by more efficient generation into electricity which is much more readily applicable than ATP is.
20,000-25,000 years ago CO2 levels were down to 180-190 ppm.
If CO2 levels had dropped to 150 ppm it would've been a catastrophe. Most plants need at least 150 ppm CO2 concentration for photosynthesis. Life could've just wiped out most of life by accident relatively recently.
The chance of that happening now is impossible because of us, but it goes to show that life is not as in balance with the world as we like to think.
As I wrote, life is not an intelligent design, it has no way of knowing better and thinking of the future: that leftover banana will rot as fast as it can and afterwords leave everything dead in its wake. It just so happened that some form of equilibrium is always met and that Earth has many kind of buffers to change. But it can’t outcompete us in burning coal, we are the new microorganism that almost killed everything by inventing photosynthesis.
A stated opinion maybe useful as an axiom for you, but most don’t believe this.
Some people believe life has a reason/meaning and is therefore worth protecting through a many faceted approach (one of which is being discussed here).
We have yet to find another world that has the right combination of googly eyes and string and tape to sustain relatively stable complex life. We struggle to understand the far reaching effects that even simple changes have on our planets systems and ecosystems. We have evidence of the system throwing itself so far out of whack that huge portions of life have died off.