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Well just wait a while. With every launch out of LEO we're removing a little bit of mass, and every day the solar wind blows away some.

Meteorites.

Edit: Dang, and yea we also the sun and cosmic rays increasing the earth's mass. Radioactive decay also decreases the mass.

So are we getting fatter or slimmer? By a quick Google survey it depends which estimates one trusts, but probably losing a bit.