You seem to be throwing these around as pejoratives, but neither of these terms has anything to do with this topic.

> doesn't care about state of the environment

Nobody but you said anything about not caring about the state of the environment.

> an old, grumpy person

You have no basis to make such remarks. Plenty of people care about the people around them, their immediate environment, and the circumstances they can personally and directly affect without getting caught up in fantasies about the future.

Wanting to send people to Mars for the good of the species is a fine idea, but your enthusiasm about it doesn't make you any more noble than someone who is simply more practically minded or not as optimistic as you are.

This kind of disrespect for the perspectives of others makes it that much more difficult to achieve the political compromises necessary to make any of these dreams a reality.