We need to replace fossil energy. Its impossible to replace 86 % of the energy we use with "renewables" like wind turbines, solar panels and biofuel. (In fact, they are not very "renewable")
The Air contains all energy and all water humankind need. With the help of Nano filter and the power from the Wind, we are today able to filter forward the size of molecules we want. With the same technique, we can also eliminate carbon dioxide from the air.