"Aside from the major environmental and social benefits, it would also be incredibly iconic," he says. "Just imagine: The world's first rooftop garden city. " It's good to see that Beirut's hanging gardens have made it to the CNN website, maybe this will incite few Lebanese or NGOs outside to finance the project. The total cost of the project is estimated at $3.5-4 million, which is honestly nothing compared to the benefits offered by this…