While the global population is set to grow by 2 billion people by 2050, the rate of global population growth is set to decrease over time (United Nations, World Population Prospects 2019).
Er bod disgwyl i'r boblogaeth fyd-eang dyfu 2 biliwn erbyn 2050, disgwylir i'r twf yn y boblogaeth fyd-eang arafu dros amser (Y Cenhedloedd Unedig, World Population Prospects 2019).