I already mentioned what needs to happen for meat carbon neutrality to exist.

For society at large we need to move away from all forms of burning/reacting carbon-based resources for energy, production of materials, and so on. Where we do absolutely require carbon-based resources that carbon should be extracted from the air as much as it is from the ground, to ensure carbon neutrality in the long run.

This means solar power, alternate plastics, and a whole host of other things.

In the short term we need research on the engineering of the environment, things like blocking out part of the sun to cool the earth and offset the global warming that has happened. Using systems that exist purely to pull carbon out of the atmosphere paid for by taxes and damages from the companies/consumers that use things that release carbon.

Ultimately, I don't think we need to do anything, because I view human society as a very large, very intelligent, very quirky decision making system. I trust that, in the long run, the decisions society makes are far more reasonable than the decisions I can make, and are based on thousands and thousands of little systems, ideas, and thoughts all working together to form an emergent machine that spans our entire planet. In this way, society will solve the issues it faces as time passes, and we just have to do our best to do what we think is natural for that to happen. If you believe we should stop eating meat, do it. If you do not, don't. Society will take your decisions and actions and at the end of the day come to the decision that is correct even if we may not agree or see that for years to come.