Asked by: Jacob Hackett, Swadlincote
According to UN Census figures, the number of births for 2005-2010 is expected to be 20.3 per year, per thousand people, averaged over the planet. The same figure for deaths from all causes is 8.5. So for each person that dies, 2.39 babies are born.
However, the birth rate is dropping while deaths are (slightly) increasing. By 2050, the ratio is expected to be 1:1.34.
- How small can a population be and still survive?
- Why hasn’t evolution made it pleasant to give birth?