Meh AT that is the most egocentric view we humans have, I mean for cryin out loud we are in a galaxy of millions of stars within a universe of billions of galaxies to assume we are it in this galaxy alone is rather arrogant.
I mean who says another species HAS to have an earthlike environment or HAS to have our comfort level of hot and cold? For all we know there could be a race out there that LOVES venus like environments or another that LOVES pluto like environments.
Oh and BTW as far as Earth being the only "blue planet" out there that too is foolish to assume because even scientists have said we would not likely see other Earth type worlds with modern technology because of orbit/temperature/reflection and various other technostuff that I don't even have a clue how to explain or understand
So if they are right and Earth type worlds would be almost impossible for US to spot then for all we know there is in Earth type right next door to us
(galacticly speaking of course) and maybe that species HAS developed the tech to spot Earth type worlds.....heck maybe we will to within the next 10-50 years or so.