Featured in energy efficiency

Lightbulbs hanging in restaurant.
Wind turbines against a cloudy sky.
City bike leaning up against lightpost.
string of lights at night
Nuclear plant emitting smoke
A person sitting on the floor, holding several $100 bills in a fan shape.
One side of a reddish-brown brick building, with 15 windows arranged in a grid on the façade, each containing a separate window air conditioning unit.
cranes building a skyscraper