If you listen only to Chicken Little environmentalists, you might think America has done little to help save the planet for future generations.

On the contrary, the country has contributed quite a bit, experts say. In the last 20 years, U.S. engineers have either improved less sustainable technologies or helped revive previously impotent ones such as wind and solar, says Joel Balbien, managing director at GreenTech Consulting.

“Cheap and powerful silicon has led to enormous energy savings in other sectors of the economy, ranging from vehicles to aircraft and office buildings,” Balbien says.

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