Why would you even want to do that?
Because I want more fellow human beings to exist. More artists, more scientists, more outright geniuses. Sure, more thieves too, but criminals affect the same share of population, whereas a single brilliant scientist may invent FTL travel or cure cancer for all...
But my wants are a moot point — the population will rise whether or not I (or you) want it, according to TFA.
What do you think filters out all of the crap we're putting into it?
Why do you hate humanity?
This individual and a Mr. Fusion, perhaps.
Mr. Fission — Mr. Fusion's older brother — would do just fine, thank you very much.
Not such a bright idea to plan on rearranging the world
I'm not planning on anything. I'm not even talking about rearranging the world — only the regions, Man may decide to populate when his technology allows.
The "rearranging" will not be any worse — nor seem any more "Star-Trekian" — than damming rivers or dredging waterways.
And you forgot all about 'ol Murphy.
He's always been with us, but we've grown in numbers anyway and are hardly starving today.