Vertebrate mass - think first
"The TOTAL MASS of all human beings alive today exceeds the TOTAL MASS of all other vertebrates COMBINED."
You're way WAY out of whack with that one, David. There are about 1.3 billion cows on Earth - with an average mass of 5x a human or more, they alone make up at least the same mass as humans. 16 billion chickens don't quite make it, but they would be over 10% all by themselves. And that's only two types of vertebrates among many thousands.