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He advocates urgently for renewable energy, for energy-smart thermostats and heat pumps.

He signed an executive order last year that aims to reduce emissions statewide and make state government more energy-smart.

When you leave your house, it's an energy-smart move to raise your settings so that cooling will only occur if the temperature exceeds 88 degrees.

Solar power and energy-smart construction help keep energy bills low.

Others are also looking at how to reimagine the way we construct urban environments, from Masdar City in Abu Dhabi with its energy-smart buildings and driverless cars to the still-theoretical concept of a vertical city -- densely packed, supertall building complexes that maximize efficiency while limiting sprawl.