On July 14, 2021, Crown Princess Leonor and Infanta Sofia of Spain attended the event '#Unarbolporeuropa' held in Hayedo de Montejo, Spain. Un Árbol Por Europa (A Tree for Europe) is a manifesto which was created by Equipo Europa following a proposal by David Sassoli, President of the European Parliament. ‘A tree for Europe’, event aims to promote urban sustainability by planting trees.