For me the application of nanotechnology to ensure that water is purified qualifies as my favorite approach. While endless pollution issues exist watching someone safely drink water that just moments before would have harmed them greatly seems is a wonderful leap.
The ted demonstration is of course in mind but I think that even more adaptions are possible including the potential to clean up existing bodies of water that have far too much contamination. Imagine putting a filter across a river and removing the pollution... I imagine harnessing the pressure of the water to constantly keep it clean and push the contaminants to a holding area so that it could be left there permanently. Imagine simply applying this type of shield over your cups and sinks so that no pollutants would reach your food. The amazing potential of these projects to create permanent solutions (no need to replace filters) gives me hope for extremely low cost production and distribution around the world.
http://www.scidev.net/en/editorials/how-nanotech-can-meet-the-poor-...An overview of where nanotechnology is.
The impressive ted conference example of drinking water being made from extremely contaminated water via nanotechnology.
http://www.ted.com/talks/lang/eng/michael_pritchard_invents_a_water...The costs of these can hopefully come down further with time and improvements made to allow them to filter out salt. Also in the future I hope to see that they can filter out chemicals as well without a carbon filter (which has a much shorter lifespan).
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