The 2020s will begin on January 1, 2020 and will end on December 31, 2029. By the end of the decade, world population is projected to surpass 8 billion people. Notable predictions and known events The interaction of the three main decadal solar cycles suggests an upcoming reduction in solar activity, with a low-energy period centered around 2020. As suggested by John Maddox of Nature, this might mitigate the global warming (at least temporarily) in the 2010s and 2020s.Assuming that the Atlantic… (More on 2020s)