I did research on the feasibility of the project and it turns out that planting a 1€ tree is impossible

https://www.reforestaction.com/ 9 millions trees planted since 2009 > As a reminder we need 1000 billion trees
https://www.coeurdeforet.com/ NGO plant in multiple countries > 720 000 trees in 2020
https://ishpingo.org/ NGO plant in amazonia > 400 000 trees since 2005

You can find many NGOs, they don't plant many trees quickly enough to effectively counter global warming

COST OF A TREE

12€ is an average cost, it may vary depending on several factors.

land in the countryside costs around € 25,000 in France for 10,000m2 2,5€ per m2

A minimum of 4m2 is needed for a tree to grow properly and to leave space for plants around

Which makes 10 € per tree

So a gardener can plant an average of 10 trees per hour. with a gross salary of 2300 €, that gives us a labor cost of 1.57 €

The price also depends on the type of tree you choose
1€ it's the price for a little tree ( 1.06 exactly for an order of 12.000 trees) 20-30 cm


You can check price here :
https://www.planfor.fr/achat,chene-liege,1033,FR

this tree is one of the cheapest and it is "resistant" to forest fires, he can reborn without help
but of course we can not only plant one species of trees, biodiversity is important


Total: 12.63 € without including water cost, tools, truck and maintenance