> And there won’t be a way to roll back those changes

It's possible to sequester CO2, and here are a couple ways.

1. Use permaculture or regenerative agriculture to aggressively increase SOM (soil organic matter) / carbon content of the soil. Typical degraded farmland is around 1.5% SOM. For every 0.1% increase per acre, roughly 1 ton of carbon is sequestered. Setting an ambitious increase to 10% would take decades but would increase yields along the way. There are billions of acres of farmland, so a lot of carbon can be removed from the biosphere. Additionally, since people naively mimic farmers for home gardening etc., if farmers were part of the solution, then more home growers would be, too. With a couple decades of regenerative ag you can go from 1.5% to 7.5%, but with more time and motivation you can go higher.

2. Research and then put into practice industrial-scale pyrolysis for energy generation. So, instead of burning methane (aka "natural gas") to boil water to spin a turbine, we could pyrolysize organic material to emit and burn syngas to boil water to spin a turbine. The resulting biochar can be co-composted and when finished, used as a soil amendment.

With a different mindset a lot can change, and quickly.