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Your next car could run on biodiesel produced from algae. Algae can double its cell mass every few hours. While it takes nature a hundred and fifty million years to make oil, oil from micro-algae can be produced in three days, and it doesn't add carbon dioxide into the atmosphere.
For populations where water is scarce and distant, the Aquaduct tricycle not only helps fetch two gallons of water, it filters up to a gallon on the way home. The unfiltered surplus in the two-gallon, unfiltered tank can be filtered later using the trike in its stationary position.