Many more people can be accommodated on our planet than headlines would have us believe. For starters, there are now six billion people on earth.
The island of Japan has about 143,000 square miles of area. One square mile has 27.9 million square feet. Japan has a total of about 4 trillion square feet, enough to give each person of the earth 670 square feet.
For comparison, if we used the American average of 8,000 square feet to four people, the entire population of the planet would fit into a space as the size of Texas and Nevada combined. That would leave the rest of the world's land for food production, entertainment, and vacations. These calculations do not include the oceans.