> Increasing our fertility period in proportion to our life span will bring the risk of overpopulating Earth. With the current birth rate per person, the number

> Increasing our fertility period in proportion to our life span will bring the risk of overpopulating Earth. With the current birth rate per person, the number of million-year-old people could increase to the untenable level of a hundred trillion. Moderating that would require a public policy that limits the birth rate to the desired level. Alternatively, travel ports could launch people into space to balance the birth rate and maintain a terrestrial population suitable for the available supply of food and energy. Wait, does it imply that the current population trajectory is sustainable?