If 20-30% of the country went vegan by the end of 2019, it absolutely would throw a wrench in the flow of massive amounts of capital. And have a tangible positive ecological effect, as big agribusiness is a leading cause of carbon emissions, deforestation, soil erosion, etc. Internal memos at these giant food corps show how explicitly terrified they are of that, and they hold just as much undue political sway in our political system as the energy and pharma lobbies, if not more.

Either way, I'm sorry to inform you but mass lifestyle changes are our only hope at this point. We can't wait for the democrats to get slightly more demsoc in the next 12 years to maybe issue some carbon tax or whatever, and it would take even more non-renewable fossil fuels and extraction to make renewables viable, so that's a false promise to anyone with common sense. Collective group action at the grassroots level, with millions upon millions of individuals withdrawing themselves from commercial markets and forming new kinds of sustainable socialist communities (ecovillages, intentional communities, neighborhood garden coops, etc) is the only way forward that actually might save us. Everything else is just "green capitalism".