Speculation on population numbers raise questions about whether the planet can sustain us all.
The world's population is expected to hit seven billion this year.
By 2100, there will likely be more than 10 billion people living on Earth.
After 2100, the population level will probably plateau.
The world's population is on track to hit seven billion this year, which is double the number of people that lived on Earth in the 1960s, but far from what the future holds. By 2100, according to recent projections by the United Nations, we'll hit the 10 billion mark.
Those numbers, which are drastically larger than anything the Earth has experienced before, have sparked concerns about how all of those people will impact the world. They have also raised questions about whether the planet can sustain us all in the first place.
There may, however, be at least some end in sight to the relentless swelling of population pressure. Around the end of the century, many demographers believe, the global population will gradually level off.