It has been said against reincarnation that there are more people now in comparison with the past world population.

It is not necessary that the same persons are reborn into this earth and none else. In the
process of evolution into human life, many from lower births also come up to the human level.
All these are controlled by superhuman powers or by the Divinity, God or Isvara Himself.
Further, rebirth need not necessarily be on this earth plane alone. It can take place anywhere in
the universe.

From „May I answer that“ by…