Nanotechnology smart monitoring membrane chemistry seawater desalination as intense pressure is placed on the planet's limited resources, businesses are again turning to technological innovation. new and emerging technologies like those listed above should see human civilization through the 21st century and into the next with adequate supplies of for people of all nations.

The answer is; water

As inland fresh water sources are put under pressure due to overexploitation, businesses and governments are utilizing reverse osmosis and other novel technologies to tap new sources of water to ensure water sustainability. Reverse osmosis is one method that produces fresh drinkable water from oceans by reversing the process of osmosis.

b.have there own function.

and after water is usually warmed by the sun the water temperature raises and then evaporates .