Should humans colonize other planets?

No, I am most firmly against it and for a number of reasons.

First, I do not think that we humans should colonise another planet and cause damage to another planet as we have to our home planet.

Secondly, there is no planet that we know where humans could exist as they do on Earth. Therefore, an artificial environment would have to be created. This would be at very great expense.

Another consideration is that we can stop polluting and damaging the Earth. We could take steps to repair and reverse that damage. That could be done at less cost than sending people to ruin another planet.

Because of the great costs involved only a small number of people who were considered important enough to go to another planet or who were wealthy enough would be the ones to go. Most of us will be left behind to take our chance.

I do no think I would go even if I had the opportunity. Today there is snow where I live and the fields behind my house look absolutely splendid. I would much rather stand in one of those fields and gulp in a lungful of cold air than live in some artificial environment. Nothing could be better than the natural beauty of this planet.

I hope we do not go and spoil another planet. I think on this occasion Hawkings was very wrong. We should stay here, take better care of our home and repair the damage we have done.

Yes we should but we're not going to.  If we were, the chances of living before it happened would be minute, so it can be surmised that it won't happen.

It'd probably be a lot better to colonize other planets, then again why not? What else are we doing that could possibly be as fun as colonizing the galaxy!?

Popular Physicist Dr. Michio Kaku, PhD has said that human life and other Earthlife is far too precious to continue to exist on just one planet. We need to be a 2 planet species (or more) in order to ensure our future survival. I agree with this. 

 I personally believe that the movie, "Elysium", starring Matt Damon and Jodie Foster, is a good representation of Earth's near future. Except that there won't be any huge orbiting habitat, as in the movie. Instead, a high IQ, high tech, high prosperity human society will arise on Mars, while the Earth wallows in squalor. In 100-200 years, humans on Mars will be sending fusion powered Mars built spacecraft to other star systems for the purpose of setting up new colonies of Earth life. By that time, humans will have colonized our entire solar system to a limited degree, and the atmospheres of the gas giant planets will be routinely harvested for obtaining Helium3 by the metric tonne to power our world wide fusion reactors and spacecraft. And Martian water is five times richer in Deuterium, the other necessary fusion fuel.

 If we ever want to raise our third world peoples up to a 1st world standard of living, we are going to need lots and lots of energy. Windmills and solar panels simply will not cut it. Controlled thermonuclear fusion power is the only answer in my opinion. Check out the ITER, under construction in the south of France: https://en.wikipedia.org/wiki/ITER

I believe that in ~500-1,000 years from now, we humans will have spread to at least 30-50 other star systems. Around that time, all humans will be required to leave Earth, and we will then allow Earth to return to its previously wild state. Bison will again roam the plains of North America, and Aurochs will once again graze the grasslands of Eurasia. I can't wait. 

Please read the excellent book, "The Case for Mars", by Dr. Robert Zubrin, PhD, available on amazon and other places.

A terraformed Mars:

We should not contaminate other planets, or moons.

yeah. i wanna go to mars one day. prolly wont tho