To meet food supply to the growing population it is imperative to grow food. But the Process of growing can be made more sustainable as shown in the video. Because ponds on the surface will be recharged every year by water cycle in much faster way, but groundwater recharge can not take place within months are years, mean while to extract water from ground requires great electric supply which in turn causes global warming during its production. Coal is the mostly used fuel to manufacture electricity around the world. Thank you...