Today facing a serious water challenges

With the development of economic and science,people’s life different from old times,it become more smarter and more convenient.But with the change of environment ,such as the average temperture had rise up 1.1℃,future will rise 3.4 ℃to 3.9℃, beside the develop of population of people, today we still facing a serious challenges--water challenges,in the future,water will become the precious recourse instead of oil,actually many countries are developing a technology which turn the seawater into drinking water,but it is a long time project.The effective way is improve the usage of water,it is a challenge for the world.