So, in my view, there are a few steps that should be taken but will not be taken.
Of the highest importance is to “encourage” less people to be born.
This is Number One.
Second, “encourage” people to NOT want an aspirational life style, repeatedly buying stuff.
In my view both these will fail
Three, start a movement to show people how ill factory food is making them, “encourage” the hoards to learn cooking with basic food.
“Encourage” people to become more physically active and reduce their time on mobile phones/social media.
Four, plant more forests, protect the forests that are left, stop burning wood in power stations and calling it green.
I think, the forests plan could work.
The less factory food and more physical exercise, must work or one quarter of the world will become obese and disabled.
At that point civilization will already be down the plug hole.