You're right that the solutions are out there, but not the solutions you're pushing. Stop eating meat? Personal austerity? Lower consumption? All non-starters because you're advocating loss. Humans hate loss.
What you need to give them is a replacement, one that is better than what you're replacing. For example unlimited energy use from renewable sources (tidal or geothermal), cultivated farm-free meat, and circularity. Those areas are not just solutions but the future. Get on board and leave your loss behind.