Funny thing is... Even if you don't believe in global warming (of which there are far more sceptics than climate change) or climate change in general, you'd have to be a complete science denier to say humanity isn't destroying this planet.
I mean, everything that causes climate change is also doing something else to harm this planet (acidifying ocean as an example).
Even if you don't believe in that, renewable energy is a must since we're not going to last much longer on carbon-based fuel from fossil sources.
And if you deny that.... Well you're either overoptimistic about space travel or you should start primary school.