If Ecosia are planting Acacia in Spain, as seen in their map, this is wrong. Wattle is invasive in southern Europe. Some are even in the catalogue of forbidden by law species. They displace native species and are a big problem in Portugal after fire forests for example. Some species are also poisonous to cattle and wild animals

Please, left conservation efforts to professionals. They study and train for decades for something. Volunteers can do a lot of harm with the best intentions.