Not only that, but many dinos had hollow bones that were probably connected to air sacs to keep them inflated, just like modern birds. The bones are huge but mostly hollow with inner struts to keep them strong but light and the the animal is held up by “engineering,” not brute solidity. In fact, on Page 14 Hurrell aludes to a need for such a structure in a large creature in his explanation of the scale effect but appears to assume that dino bones were constructed of “bricks and mortar” instead of trusses and struts.
At least where human sizes are concerned, a more likely cause is diet. According to the Wikipedia article on human height young North Koreans are on average 5.5 inches shorter than South Koreans. Koreans over 40–raised before the NK economy tanked–are roughly on par.
Back in college physics, I remember doing a problem on a test that asked us how fast the earth would have to be rotating for centrifugal force to cancel out gravity at the equator. The answer turned out to be “so fast that the earth would complete one rotation in about two hours,” or ~12 times faster than it is rotating now.
I always wondered how accurate that was, and, assuming it was accurate, if that would be too fast for the earth to maintain its structural stability.
Since I long ago learned that whole bit about teaching a man to fish, chorpler, I gave you the (stolen, because I didn’t take College Physics) formulae and it’s your turn to work out the answer.
You’re on your own with the the structural integrity question, but I’m thinking, in my ignorance from not having much physics training at all, it still ain’t enough for planetary destruction.