Eco Check-In – Terminal 4 at Madrid Barajas Airport (VIDEO)

(TrendHunter.com) The greenest way to check in for a flight may also be the most yellow. Madrid wants visitors to know from the moment they land that its citizens are concerned with the environment.

The $7.4 billion Terminal 4 at the Madrid Barajas International Airport has a canopy of wavy bamboo ceilings with bui…

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