Istanbul is thinking of using the Bosphorus' river currents as an energy source.
Istanbul is thinking of using the Bosphorus' river currents as an energy source. Steve Brandt/Minneapolis Star Tribune/MCT
Istanbul is thinking of using the Bosphorus' river currents as an energy source. Steve Brandt/Minneapolis Star Tribune/MCT

As nations dither on climate change, big cities step up

November 23, 2010 3:38 PM