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Just for fun, however--after you've been doing this job for a while you get a pretty bizarre notion of what constitutes a good time--suppose 1,000,000,000 Chinese, give or take 27,000,000, were somehow to materialize atop chairs without their having to elevate themselves thereto. And suppose they jumped off.
Having performed astonishing feats of mathematical acrobatics (requiring the entire afternoon, I might note--sometimes I can't believe the crap I spend my time on), I calculate that the resultant thud in aggregate would be the equivalent of 500 tons of TNT. Not bad, but nowhere near enough to dislocate the earth, which weighs 6 sextillion, 588 quintillion short tons. I refuse to even discuss what would happen if all the Chinese yelled at the top of their lungs.