First, we've got population. The world today has 6.8 billion people. That's headed up to about nine billion. Now, if we do a really great job on new vaccines, health care, reproductive health services, we could lower that by, perhaps, 10 or 15 percent.
https://www.ted.com/talks/bill_gates_innovating_to_zero/transcript?language=en
Does he also support the 10 gazillion genders? I've found this to be true pretty much across the board with liberals. If he does, then he's selectively believing the science. We have X X and XY with a few variations but they're still male or female.