Which energy-efficient invention, patented in 1976, has saved consumers more than $1 trillion in utility bills and prevented over 7 billion tons of greenhouse gas emissions?

Throughout history, inventors have created sustainable solutions to global problems. Some of these innovations dramatically reduced environmental impact while revolutionizing their industries. This trivia question explores one of the most significant sustainable inventions of the 20th century that transformed how we approach energy conservation. Test your knowledge about this groundbreaking discovery that continues to influence sustainability initiatives worldwide!

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Compact Fluorescent Light Bulb (CFL)
Photovoltaic Solar Panel
Programmable Thermostat
Low-Flow Water Fixture