"Together, we act for the planet and for future generations." As the world paused to reflect and act on International Earth Day 2025, one group of passionate university students in Tanzania was already in motion — hands in soil, hearts united, and minds focused on climate action. Under the powerful theme "Commemorating International Earth Day by Taking Part in a Tree Planting Campaign Aimed at Conserving Our Campus Environment and Contributing to Climate Action – SDG 13," the

The YouthMappers UFRJ chapter (Rio de Janeiro, Brazil) and the Virtual Institute for Sustainable Development (IVIDES.org) carried out a field mapping of trees on OpenStreetMap on the campus of the Federal Rural University of Rio de Janeiro (UFRRJ), with the support of mobile applications. The MapComplete (https://mapcomplete.org) application was used to record photographs of the individual trees and include data on relevant attributes, such as the circumference of the tree, i