Learning how to exploit these things should be our top priority considering our situation. Also not to mention finding a new home and learning how to build up the infrastructure is also important, Earth is dying we will need a new one in the the short term future.
I firmly believe that the "space colonization" dream is utterly impossible - it's just an extrapolation of the old colonists' dream coming to America. This time, however, the very laws of physics are not our friends. I recommend to everyone this excellent article I found on Slashdot years ago:
http://www.antipope.org/charlie/blog-static/2007/06/the_high_frontier_redux.html
Just a single quote: "I'll believe in people settling Mars at about the same time I see people settling the Gobi Desert. The Gobi Desert is about a thousand times as hospitable as Mars and five hundred times cheaper and easier to reach. Nobody ever writes "Gobi Desert Opera" because, well, it's just kind of plonkingly obvious that there's no good reason to go there and live. It's ugly, it's inhospitable and there's no way to make it pay. Mars is just the same, really. We just romanticize it because it's so hard to reach.
...
Colonize the Gobi desert, colonise the North Atlantic in winter — then get back to me about the rest of the solar system!"
In other words, if we are admitting the possibility of killing Earth's biosphere soon, we are also admitting our instincts has led us to an evolutionary dead end, and that despite all the rational thinking, we are a suicidal species. Compare it to the current "perpetual growth" economic propaganda, and you get a picture of clear insanity.