For me, Solar Desalination ...

For me, Solar Desalination and /or Filtration using variable pore structure micro filters (VPMF) are at the forefront of technology advances merely by its low operating cost and ease of use. VPMF utilizes nylon filter elements that can withstand the harshest environment except high temp. Solar Desal utilizes sun energy to heat the water to evaporate and collect the pure water produced. Smart it is because when there's no more power, one do not have to die of thirst for lack of water to drink. Very basic and primal.