I still believe in this old saying "charity starts from home". Every month activities should be done like planting trees, watering them, pruning them at home as well as in neighbourhood. NGOs and clubs should do campaigning where kids and parents, teens, adult can participate in tree plantation activity. Not only at home, but nearby area, city, outskirts plantation should be done.
Also, when we travel on highways, roadways, and when we take breaks for food or sight seeing, we should carry seed bags of different plants and try to sow them or just can distribute it on the soil, so that atleast 5/10 seeds can grow up as plant and trees and we can have lush greenary everywhere, as the survival rate of the seeds or saplings happens.