Some thoughts from Ran Prieur
..."some catastrophes are now so far along that "what can I do to stop it" is the wrong question, and the right question is "what can I do to survive it, to help others survive it, to minimize suffering and prepare for recovery?"
Find a landbase and build the topsoil; plant fruit trees and vegetable gardens; learn to forage and hunt and repair stuff; learn uncommon useful skills; make local friends; work to make your city and region more sustainable and resilient; make friends in other regions in case you have to move; gradually shift more of your activities and dependencies out of the money economy; break your addictions; get healthy; spend your money on tools and skills and long-keeping food; meditate; exercise your intuition. This is not meant to be a complete list, but a list of examples of the kind of thing you should be doing...
...because when pavement turns to forest, the pavement does not turn green and put down roots -- plants crack the pavement and grow through it. So do that."