The world’s population is around 7,5 billion people and Earth’s total land area is 150 million square kilometers. Therefore, the worldwide human population density is around 7,500,000,000 ÷ 150,000,000 = 50 per km2. It’s equal to Iran’s density.
If we look at the picture below, Iran is not in the dark red area which categorized as the overpopulated region.
So, I think Earth isn’t overpopulated.
I hope with technological development, humans can live in deserts and poles a few decades later.