There are 7+ billion different opinions about what that "should" be. Pick one that feels right to you and do it.
Which is a short way of saying that since the problem entangles most aspects of the human presence on the planet, there are no clear-cut answers.
Humans acting in large groups have very little in the way of common sense, rationality or strategic ability. Instead they are largely driven by short-term emotions - especially whenever the question of loss enters the picture. That doesn't bode well for us being able to thrash our way out of the bag we're in. The problem is global and universal - it affects everyone on the planet, and it's caused to some extent by everyone on the planet. But to do anything serious about it would have required a collective decisions by everyone on the planet to accept lower incomes today and lower expectations for a better life in the future. That's precisely the kind of decision we can't take.
Some people recognize that fact on a subliminal level, and as a result either bury themselves in the minutia of daily life, turn to vociferous denial, or cling to different kinds of "hopium" like wind, solar or nuclear power, electric cars, geoengineering, Permaculture, disaster prepping, Transition initiatives, meditating in groups to raise the vibration level of the species, and other such nonsense.
Imagine your doctor giving you a terminal diagnosis with one full, healthy year left to live. Decide what would be most important for you to do with that year. Then do it for as long as you have left.
I call it "Eat, drink and be mindful."
On edit: Oddly enough, this isn't as bleak as it sounds. If you practice this approach, you may find yourself tapping into a storehouse of presence and joy you never imagined you possessed. Living fully and joyfully in complete awareness of the presence of death is one of the highest forms of personal practice there is. It's hard to do, but more rewarding than you can imagine.
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