Where will all 110 billion people on Earth live in the year 3000?

Answer 1

Based on current estimates, earth could not sustain that many people. Current estimates indicate that Earth could sustain a maximum of about 40 billion people at a very low standard of living, and fewer at a higher standard of living. Currently it is believed that the world's population will top out between 9 and 10 billion in the mid 21st century and then start to decline. But it would be impossible to predict what the population will be in 1000 years.

Answer 2

In the near future, if we create chloroplasts for human photosynthesis, we don't have to eat food anymore. In this case, we can continue to futher expand the world population. All the rocky planets like Venus and Mars maybe terraformed into a habitable world.