There is the possibility that the faster than usual water evaporation is caused by global warming. The video says that it is unusual that rapid evaporation is coming from drought stricken Africa. It makes sense though, it's experiencing drought because of rapid evaporation. I don't think there is anything unusual about that.
I am not out right dismissing this theory, but I am also not dismissing the fact that it could be have been naturally made due to global warming. Instead of simply pointing out the spots of rapid evaporation, a better investigation into the matter would be to monitor the temperatures in the area. A constant increase in temperature would indicate it is a natural event. Meanwhile an instant rapid increase in temperature would indicate the possibility that it is man-made.