Could 100 billion people live on the earth at the same time?

Answer 1

typically, 100 billion people should not be able to live on the Earth simultaneously.

but we humans are able to adapt easily and if we cut down rainforests and found a way to live in the ocean it is incredibly possibly to have 100 billion people on the Earth at the same time. then again, humans will not be able to live that long with those conditions.

Answer 2

In the near future, if we create chloroplasts in human cells for photosynthesis, then we don't need farming or agricultural societies anymore. In this case, the earth may support 100 billion people. If 100 billion people lived as dense as New York City, everyone would fit into Argentina.