I would like to see more action to tackle climate change. Not that he's an expert by any means but Patrick Stewart said he's prefer to see our efforts and energies put into helping our own planet rather then reaching out to other ones.
I personally would like to do both!
As for Kim Stanley Robinson... I've read his Mars Trilogy of books and really enjoyed them (though they are very heavy going), they come across very realistic and you can actually imagine his stories happening. So I'd certainly recommend him to people, just to warn though, he's not an action writer and events don't happen quickly. He's more into the details, the kind of books you'd love to see turned into films but you just know they wouldn't be anything like the books.