There have been many studies that have been conducted so far in order to measure the global population in the year 2100. However, the estimates which were projected earlier are much higher than the estimates made now. With the passage of time, the results denote that the people are provided with the best possible opportunity to access the efficiency of the population by ascertaining that with the changes being felt in the surroundings around the environment, therefore, are having an impact on the fertility of the people due to which their efficiency to produce offsprings is decreasing with every possible day. This is also because of the reason that with the decrease in the working-age population in countries like Spain and Japan, there is a dearth of the working-age population due to which the tendency of the existing population to reproduce their younger ones is on the decrease. In addition, there has been an increase in the situations in which the people are becoming more inclined towards supporting the nuclear family. Therefore, at the end of the day, what matters is the fact that the people are provided with the care and attention they require.
REf art: https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)31523-3/fulltext