Alternatives to our current Life Situation

Mars. We recently sent out Curiosity to land on Mars.  Since then we have discovered that Mars has had water on it and that it could possibly be Terra-formed in a few thousand years.  Now that is the most known alternative but here are some other alternatives.  There are many other planets outside of our solar system that could be habitable as well.  And as Mr. Gessler stated last week the basis of Drake's Equation means that there could be an infinite number of planets like this.  The one planet that we are most curious about is Gliese 581g.  It has an extremely close resemblance to earth and is one of the closest planets for us to travel to with the right technology.  Now the last alternative is something I had only learned about recently and it is called a Dyson Sphere.  Now this one is only theoretical.  The idea is that we enclose a star and this sphere and it could give us optimal conditions to live.  And it could increase our technological output for years to come.  Many people argue against it but we won't know unless we try.  All of these are just ideas no set plans just yet. 


http://www.space.com/16722-top-5-habitable-alien-planets.html
http://www.forbes.com/sites/alexknapp/2012/04/03/destroying-mercury-to-build-a-dyson-sphere-is-a-bad-idea/