I'm bringing this over from another thread rather than go further off-topic there.
I am more focused on an individual, family and small community level of how to get through the coming lean times.
Here's my take on what one should do. The first bit is quite selfish, but most of us do look after ours and ourselves first...
1) Do a thoughtful analysis of where you live. Not just your personal residence but also your community and financial base.
If you live in a place like Arizona which is facing water problems, close to a coastal area which may get hit by even stronger hurricanes, or in even a 500 year flood plain, give thought to relocating.
Even if your house/business would probably survive, your investment may not.
Consider selling out while property values are good and let someone else ride it into the ground.
(I did warn you this was going to be selfish.)
2) Invest as much as you can right now. Keep your debt load as low as possible.
Climate disruption is likely to lead to economic disruptions and fairly certainly to higher food prices. You may have to spend a lot more on food in the future. You may not have extra money to invest for retirement and you may need those unnecessary loan payment dollars at the grocery store.
3) You might want to start messing around with learning how to grow and preserve food. If all you've got is a sunny window, grow some herbs. It will teach you how to grow stuff. If you've got a balcony then grow yourself some salads. Lettuce and cherry tomatoes do quite well in pots.
Growing your own and preserving some is a great way to cut your grocery store bills. You don't necessarily need to be doing it now, but having the skills in hand can be reassuring.
You don't need a large area in order to produce a lot of food. Get a copy of John Jeavon's "How to Grow More Vegetables" excellent book. He'll show you how to grow a tremendous amount of food for a family of four in less than a 40'x40' back yard. How to provide a lot of food for one person with only a 20'x20' space. His 'stuff' works. I've been using him as my guru for almost 40 years.
If you've got outdoor space then plant some fruit trees. It takes a few years for them to get into production. Stick some edible shrubs into your landscaping.
Learn to eat less meat. That's where the really big cost increases are likely to come.
Then, helping your community.
1) Cut your own energy use. Install solar if possible. What you don't use can be used by someone else and what you cleanly generate can be used to cut the use of fossil fuels.
2) Do what you can to educate others. Anything you can think of.
3) Support and vote for people who will work to make things better rather than those who will fight to keep us on the destructive path.