Interesting question. I started writing and it just poured out. Sorry but its a bit disorganised and long.
We need to start having a macro view of the world. Start looking at world’s best practice and start emulating that in everything. Stop waiting for everyone else to do it. Stop looking at cheapest, and start looking at best value for money for the life of what is being looked at.
Town planning and home design needs to undergo a fundamental change. We know that high density cities create micro-climates which exacerbate and multiply the climate change. We need cities and communities to develop differently with lots of green spaces and less closely clustered concrete and glass. Buildings whether a home or an office block need to be solar oriented to maximise the benefits or the sun for heating and minimise cooling. Natural ventilation systems need to be incorporated into buildings. Look at the old low tech styles of housing with big wide verandahs and lifted off the ground for cooling. Look at semi underground or underground housing to insulate buildings from the climate and stop them being burnt down in bushfires (of which there will be more and more). Stop councils opening up land for development in flood zones and natural waterways, even if they have been dry for a long time. The oceans are rising so stop buying/selling land just above (say 5m?) sea level. All homes should have power generation capability (solar, PV panels, winid, etc), and water tanks. Again this will reduce the demands on infrastructure.
Then we need to stop the disposable mentality we have with all goods and appliances. Make repair-ability mandatory. This will reduce the need for raw materials. Make having a repaired item a source of pride, not of scorn and the marketing gurus would have. Take on the Japanese concept of “Kintsugi” (translates to repair with gold) which shows that repaired items can be beautiful.
Stop the current push to have ‘the latest fashion’ constantly being pushed at people. It is not necessary to have a new … (clothes, car, phone, computer, etc) … every season or year. This will also reduce the consumption of raw materials and the use of energy.
Return to home grown food. Everyone should grow some fruit and veg at home. Every bit will reduce how much needs to be transported. Start eating ‘not perfect’ fruit and veg. This will reduce waste that would need to be thrown out. Get rid of lawns - they are great in the UK, but not in our climate. Plant other stuff instead that doesn’t need watering and will hold the moisture in the soil.
Make public transport free. Then people will use it if can get them where they want to go. This will take the strain off fossil fuels, and less vehicles will mean that there is less pollution, etc. Public transport needs to be looked at differently. Stop putting in light rail, There are better and more flexible transport systems out there which provide the same outcomes but cost less to buy, are cheaper to run. and are less disruptive.
Require our politicians to be planning decades ahead of all of our needs instead of only looking to the next election.
So all up, to survive we need a complete rethink of how we live, consume, and move about. This should preferably be done by scientists and not politicians. And then, we need long term plans to implement the recommended changes.
Anything less will be too little and it will be our descendants that suffer the consequences.