I noticed this interestingly disturbing article about the formation of ice crystal sheets from jet contrails and the possible negative effect on global climate this AM:
http://www.theatlanticcities.com/com...-climate/4769/
It jogged my memory of a PBS NOVA documentary of a few years ago:
http://www.theatlanticcities.com/com...-climate/4769/
It jogged my memory of a PBS NOVA documentary of a few years ago:






