Did you read my blog posting disputing the claim that the three-day absence of contrails had a significant influence on the climate post-9/11?
According to US scientists who studied US skies after the September 11 terrorist attacks in 2001, the absence of artificial clouds caused by the grounding of all civil aircraft triggered variations in the earth's temperature range by 1.1 degrees Celsius (2 degrees Fahrenheit) each day.
Here's a great video to watch about those original claims.
