"David M. 'Dave' Travis" was a Democratic Party/Democratic Party member of the Wisconsin State Assembly, representing the 81st Assembly District from 1983 through 2009.

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Contrails are denser and block sunlight much more than natural cirrus clouds.

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I think what we've shown are that contrails are capable of affecting temperatures. Which direction, in terms of net heating or cooling, is still up in the air.

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We are currently finishing up research that is looking at the causes of increases in jet contrail coverage beyond simply increased number of flights. These results are currently in review and will hopefully be published later this year.

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We can only hope that the September 11 tragedy never happens again.

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We studied the change in temperature range that occurred during the three-day period immediately following the 9/11 terror attacks when airplanes were grounded and compared those to the three-day period immediately before and afterwards.

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