What most naturally follows?

How to become involved in the green wave
Understand what will happen.
Participating schools will plant one tree on or around 22 may, the international day for biological diversity (ibd). Students will count down to 10 am local time, when they will water their tree, thereby creating a global " green wave ".
Students will upload photos and text summaries to an interactive map on the green wave website to share their tree-planting story with others. This map will go live at 20:10 local time, thereby creating a second " green wave ".