This reminds me of when all the planes in the USA (and several other countries) were grounded after 9/11 and there was some evidence that it affected our temper

This reminds me of when all the planes in the USA (and several other countries) were grounded after 9/11 and there was some evidence that it affected our temperature variation because there weren't any contrails in the sky. http://www.cnn.com/2002/TECH/science/08/07/contrails.climate/index.html http://www.cnn.com/2002/TECH/science/08/07/contrails.climate...