> it cannot not alone bring humanity into the bright future

and

> Look at how we are (mis)treating the environment

It took the realization that we are living on something that's not flat, and actually sharing the same sphere, to make people conscious that we are at risk when damaging the environment. This is linked to everything we have learnt through our exploration of space and the fact that we could NOT find find life so far on any other planet in the solar system.

Not sure why you think it's no so important. Actually, it's the other way around. In order to better protect our environment, we need to do more research to better understand the climate models of other worlds and make correct assumptions on ours in the end. If we only study a system with n=1, we can never be sure about our predictions.