We cannot lower carbon emissions if we keep producing steel with fossil fuels.
The bicycle and the bow are both highly efficient, human-powered technologies that could substitute for two very harmful alternatives: the car and the firearm. Why do we promote one but not the other?
While manufacturing modern firearms and bullets depends on a global supply chain and fossil fuels, bows and arrows can be made anywhere out of anything, using only human power and simple hand tools.
For being such a seemingly ordinary vehicle, the wheelbarrow has a surprisingly exciting history.
Narcís Monturiol successfully resolved the two basic obstacles presented to submarine inventors: air supply and mechanical power.