Forests slowly spread onto nearby natural ground. Chop trees for saplings (or craft them from wood) and plant them anywhere natural — pave around a tree with concrete to keep it as a single decorative tree.
Mods introducing new content into the game.
Counted when a user downloads a mod release for the first time. Before Nov 2021 it counted everytime a user clicked the mods download button.
Counted when a user downloads a mod for the first time. Has no data before Dec 2022