To be honest, it depends.
Most of the trees planted are not meant for giving food or to be cut and sold for direct material gain, the indirect value for the people and the environment is complicated to determine.
Trees are the only extremely economical and super easy way of storing CO2.
Scientists from Oxford University have said that planting trees is the best method for taking carbon dioxide out of the atmosphere and for combatting global warming. Trees are very easy to plant and, as years go by, they take CO2 out of the atmosphere and into long-term storage. On average, we calculate that each tree stores 10 kg of CO2 each year. In the tropics this figure is many times higher.
That’s why compensate our environmental impact with accountable projects AND we plant trees.