2021

Predicted and scheduled events

 * March 30 – The James Webb Space Telescope is scheduled to be launched after being delayed several times.

Date unknown

 * India hopes to conduct its first human spaceflight in 2021.
 * Brood X, the largest brood of North American seventeen-year cicadas, will emerge.
 * Costa Rica has pledged to become a completely carbon-neutral nation by this date. The target date has been set by President Óscar Arias.
 * Costa Rica has pledged to ban "single use" plastic products. The target date has been set by President Luis Guillermo Solís.

In fiction

 * 21st century in fiction