The government and public authorities will sign a plan; then it goes down to multiple intermediaries, and by the time it reaches those planting the trees get little to care. It is rampant with corruption and fraud. If I have to put in numbers, here is an idea -- if there is $1 available for every tree to be planted, anyone in direct benefit at the final step gets less than 10¢. Those organizations and people "shouting" about planting trees goes on to the next plantation project, and it goes on.
I have been involved with and have invested in nurturing an ecosystem in a remote corner of India. I have got the involvement of the locals, and they know what trees/plants to grow that will benefit not just in sucking in CO2 but bears fruit that the locals can leverage. The idea is to have a tangible outcome from the trees that we can create a circular economy and treat the Climate actions as a good side-effect. The locales have no clue and don't even have enough to survive to care about Climate Change.