graphs below are based on data from the United Nations (UN) and the
US Census Bureau.**
here, population growth increased significantly during the Industrial
Revolution. The last 50 years have seen a yet more rapid increase, due
to medical advances and substantial increases in agricultural productivity,
particularly beginning in the 1960s with the Green Revolution.
increase in human population over the course of the 20th century has
raised concerns about whether Earth is becoming overpopulated. The scientific
consensus is that the current population growth and exponential increase
in use of resources are linked to threats against the ecosystem - such
as rising levels of atmospheric carbon dioxide, global warming and pollution.
It is possible
that disasters triggered by the rising demand for scarce resources will
eventually lead to a sudden population crash, or even a Malthusian catastrophe.
just the medium variant, the population forecast looks like this. However,
it should be noted that this graph takes no account of future medical
advances, or other factors (such as deaths from climate-related catastrophes).
It is based purely on the current trend:
the population growth rate has been declining from its peak of 2.2%
in 1963, but growth remains high in Latin America, the Middle East and
countries there is negative population growth (i.e. net decrease in
population over time), especially in Central and Eastern Europe (mainly
due to low fertility rates). Within the next decade, Japan and some
countries in Western Europe are also expected to encounter negative
population growth due to sub-replacement fertility rates.