From the "contrails" thread blinky-

"It had been hypothesized that in regions such as the United States with heavy air traffic, contrails affected the weather, reducing solar heating during the day and radiation of heat during the night by increasing the albedo. The suspension of air travel for three days in the United States after September 11, 2001 provided an opportunity to test this hypothesis. Measurements did show that without contrails the local diurnal temperature range (difference of day and night temperatures) was about 1 degree Celsius higher than immediately before;[3] however, it has also been suggested that this was due to unusually clear weather during the period.[4]"


CURE for Global Warming! Just increase the air traffic world-wide to levels like those over the US.