The writing on the wall is very clear....If the concrete jungles are not covered with a natural green cover then the Urban Heat Island effect will rise to such a level that cities will get completely devoid of any rain or cool breeze. They will become like "sweltering ovens"!!! We have to convert rooftops into Organic farms where safe and fresh veg can be grown, using just 25% of the water being used by a conventional farmer!!