Beirut Wonder Forest is an environmental initiative on a city scale launched by Wassim Melki and myself in Beirut–2012

Beirut is a concrete and pollution mayhem and there is a huge lack in green spaces. Therefore, given the circumstances, our initiative came to be by suggesting that each building grows its own rooftop garden.
Nothing fancy, just a couple of trees in a large fixed pot on each rooftop. The municipalities offer tax reductions or benefits to the buildings that have a well maintained rooftop garden, and the gardening/plant companies could offer discounts and sponsorship.
Ultimately, the plan was to have beirut as a rooftop wonder forest, but the initiative managed to be applied on 40 public schools in Beirut through governmental support and funding.