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There's some anecdata from 9/11 https://globalnews.ca/news/2934513/empty-skies-after-911-set-the-stage-for-an-unlikely-climate-change-experiment/ https://globa

• dylan604 1y ago
  The NASA image does make contrails look much larger than say from the ground, but even in the same image true cloud cover is clearly more complete than all of the contrails combined from the same image