At least three companies want to bring supersonic airplanes back to the skies, but environmental groups say that could mean more greenhouse gasses.
from USATODAY - News Top Stories http://bit.ly/2MGx3Y2
Global warming: New supersonic airplanes would be terrible for environment, study warns
![Global warming: New supersonic airplanes would be terrible for environment, study warns]()
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January 30, 2019
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