God told Adam and Eve: 1be fruitful and become many and fill the earth and subdue it.’ The earth was stay filled with their perfect righteous descendants who were not meant to die off and make room on earth for pothers to occupy. The earth was not meant to be a proving ground to provide inhabitants for heaven. Adam and Eve were not told to become many and fill heavens. They were told to `fill the earth and subdue it.’
God did not need their help to fill heaven with people. He assigned to Adam and eve and, though them, to their descendants the privilege of filling the earth to say filled with human creatures living in perfect harmony with god.
No population explosion
What we call ``population explosion’ is only on earth. Taking earth as a nursery for trillions of other planets, to which human race will start transshipment in other hundred years; there is no problem of overpopulation even if all the men that are born on earth are so perfect that they never die.
Modern –day scientists tell us that, despite the billions of starts and galaxies throughout the visible heavens, the most impressive thing about outer space is its emptiness. That being, so, then it would take a long time for Adam and Eve and their off spring to populate the boundless heavens.