Even most of scientist today estimated that the sustainable population on earth is around 10 billions. Our current population is around 7.5 billions from 4300 years ago...considering 1 million years a day that would put the population around 490 billions for a merely 1 million years...more than your scientist estimate.I think it is wonderful when we read the creation account in Genesis and see proof of God's divine inspiration right at the beginning of the Bible which has been proven by today's scientists who confirm the six geological era that took place over millions of years.
Not only science cannot substantiate your claim, but you have problem...with god created heavrn and earth in six days....but also is God a liar when he sain i created the earth to be inhabited 1sa 45:18...making the earth wait 5 million years later...