We're still not ready for interplanetary colonization, we'll pollute and destroy the new planet like we do earf right now.

Once we fix all of earf's problems, then we should pack our bags and leave.

This

Well said.  Earth is like paradise,  a mini oasis in a big dark and empty space.  Why would I want to leave. 

It'll happen but in 150-200 years or so (in a really big way). We're stupid, we're gonna end up destroying this planet in order for the species to survive we need to spread out so that one catastrophic event (or a quick succession there of) can't wipe out the species.

Well one, our generation doesn't mean shit. We will die here and that's all there is to it. 

It's relevant however to generations 2, 3, 4, waves beyond us and by then Earth may be far from a "paradise". 

Besides "easy living" isn't the pre-requisite for the human (or any other animal species) species. Realize the majority of your blood line lived in harsh conditions and many of them did not know when/where their next meal was coming from and lived with no automated heating, no working toilet, at the mercy of many elements, etc. etc. etc. This is a hostile planet and our ancestors when you look past the last 200 years (a blink of an eye) endured tremendous hardship, never forget that. People settling on even alien planets, as harsh as they would be, would still have many advantages humanity didn't have 200-300 years ago. 

It looks like the universe itself will end anyway when all the expanding matter uses up its energy and contracts back down again to a single mass for the big bang to start again and I think its reasonable to say no intelligent life could ever survive that process so there is a finite limit to man's existence even if we reach the stars and even other galaxies.

Saying that I still think its important as a species to survive for as long as possible. I guess I have some loyalty regarding the human race for some reason and don't wish our culture to die. Just reading a book and engaging with the mind of someone who may not exist anymore is quite an amazing process when you think about it. When you look at the people of the past who have longed died was their existence pointless? I'd like to think it wasn't.

I can understand that in his situation, evacuation can be a tricky and urgent problem... Ah, didn't he mean
THAT kind of evacuation?

Roughly the plot of the Killzone series.

We are gonna die as a species if we don't eventually move beyond this planet. Whether it be from us destroying ourselves or some other disaster.

Also the much older Mechwarrior 2: Mercenaries. While the opposite, Earth attacking the colonies would be like the even older Terra Nova: Strike Force Centauri.

The earth and the sun will be around for millions of years. plenty of time for future generations who will be much more advanced to do all those things. we might aswell just chill out and enjoy life.