My list is shorter: 1. Stop burning fossil fuels.
That's it, really. Technically there would still be other things to do, but they are trivial by comparison. Stop burning fossil fuels and the rest will follow. It will require major changes to the way the global economy works. In other words it will require major changes to the way we live our lives. Do not build any more gas power stations. Do not mine any more coal. Do not build any more diesel trucks. Do not sell any more petrol cars. Start digging up the gas lines for recycling. Stop using airplanes. Take approximately 100% of the enormous budget for road construction and maintenance and use it for electrified rail and nuclear power instead. There will be much less transport and travel. Agriculture will need to be reinvented. It is difficult to imagine. It is easy to summarize: Stop burning fossil fuels. Do it now.
This being c/collapse obviously we all know it isn't happening, but that's what would work.