Imagine being able to control street lights with your mobile phone. This isn't a prank, but an eco-friendly solution now in place in parts of Germany.
The (I must add) responsible denizens there have put in place a system called Dial4Light that lets cell phone users turn on the street lamps only when someone actually needs illumination. We won't suggest this for streets like Harlem or the dodgier parts of Asia since it's so easily subject to abuse.
Much like your very own on/off switch at home, this one requires you to dial up the lights, with a 15-minute grace period before it gets pitch black again. And the best bit, a reported cost savings of 25 percent in power bills for the the towns, not to mention everyone doing their bit to reduce their carbon footprint. Just don't leave home without your phone.
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