Well, think of the math. Let's say each tree costs $2 to plant. That includes:
- cost of tree
- transport of tree
- labor (usually at least 10 min/sapling)
- overhead of managing the program
That's $336M. Unless this is one of the most successful search companies of all time, that's an unfathomable number to add to all of their other costs.
Tree-planting programs are all green washing in my experience anyway.
Why do you think it’s not possible to plant 168M trees? They have partners all over to physically plant tress.
https://blog.ecosia.org/tag/where-does-ecosia-plant-trees/