halim sbai runs a small cafe here, and he also works as a tourist guide.ascinated by how the climate is changing his home country. chemist meryem tanarhte is researching this exact subject at the university of casablanca. studies predict that the temperature in north africa will rise twice as fast as the global averagege. >> the hot desert climate e wil be worse in ththe future, and especially in the e summer. the increasese of temperature will be upup by two degrees, threree degrees. >> two thirds of all oases in morocco have disappeared over the last century. halim and the farmers are hoping to stop the advance of the desert with bushes and trees, but also a new patent from holland. the waterbox is a pot made of bioplastics. this fledgling tree is placed inside, and then planted in the soil. then the waterbox is filled with plenty of water. the hope is that this method will give the new tree a natural water tank, and a better chance of survival. trees and bushes as a barrier. this is one way that the last fertile fields will be defended against the sahar