People are motivated by many things. They don't need fairy tales. Religion and superstition has ruled over people for thousands of years. Let's give evidenced-based approaches a few millennia before we go back to that garbage.
So far evidence-based approach seems to end up as YOLO-style approaches.
Overall culture seems to be more and more nihilistic and individualistic after dropping religion. Few people may be doing the right thing and say that we have to care about future generations. But wast majority, looking at their actions, doesn’t care.
It may be hard to accept that the universe exists for no reason at all. You can fall in to a nihilistic trap where nothing matters. Or you can fall into a fantasy trap and say it matters for reasons that are not true.
I would rather follow a more humanistic path, that we define our own existence, and that we should attempt to minimize our own suffering.
If people would believe religion stuff, it’s be pretty easy to motivate them to clean up the damn planet. Of course, given that the leaders would sign off on that.
Why strive for anything? Especially when the very bare minimum for survival is already covered by community.