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Energy no object, it's a matter of harvesting it and dissapating the wasted heat.

After all, the sun send more energy to the earth in one hour than we use in an entire year as humanity.

Mmm, that's kind of hand-waving away the hard part. In practice, that has been hard enough that energy generation is an issue.

There is the slight issue that no matter what energy source we use, we need to reduce energy growth. Postulating a meagre 2.3% growth in energy use forever, we'll get the surface temperature of Earth to the boiling point of water in 450 years.

Source http://physics.ucsd.edu/do-the-math/2011/07/galactic-scale-e...

You can refrigerate the Earth. You don't even have to refrigerate it; approximately the entire sky except for the Sun is a few degrees above absolute zero, so you just have to increase your radiative coupling to it --- effectively putting cooling fins on the Earth.

Or you could use the energy somewhere besides on Earth.

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