Throw as much engineering and innovation at the problems as possible. Conservation alone is no longer sufficient.
And I meant problems. As in, protecting the food supply chain, protecting the electronics supply chain, adopting a defense posture to prepare for a far more desperate global population, finding ways to save coastal cities or quickly relocate people, throwing everything at the wall for innovative new exotic energy generation and storage systems (far past nuclear) and, most importantly, preserving the knowledge and means of humanity.
We're past the point where pretending this will get fixed politically is reasonable. We need to assume it won't and work to protect the future in spite of the horrors to come.