| The jet engine contrails have have caused most or all the warming observed in the United States for nearly 20 years. |
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| Although this complicates global warming arguments, it offers further evidence that contrails do affect climate in some way. |
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| Higher and farther to the west the contrails of the aircraft bent around the mountains and merged with the clouds, pointing north. |
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| Yesterday, under a blue sky striated by the white contrails of jets, Stack was laid to rest in Arlington National Cemetery. |
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| In another study, a scientists observed single contrails produced by military jets that were allowed to fly during those days. |
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| For the benefit of those who cannot tell chemtrails from contrails, he offered the following explanation. |
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| A couple years ago, I was fascinated to hear about the possibility that airplane contrails have an effect on the weather. |
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| Like other high, thin clouds, contrails reflect sunlight back into space and cool the planet. |
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| There was no smoke or contrails behind the craft, and it made no noise in the perfectly clear sky. |
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| The reason, it turns out, is that American airspace was shut down, and no airplanes means no contrails. |
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| The UK suggested adding a bullet on contrails and cosmic rays to improve the understanding of policymakers on these issues. |
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| However, the fact that the volume of air traffic is set to rapidly grow in coming years makes it important to investigate the effects of contrails on our climate. |
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| They speculated that the nuclei of the ice ball could have been lingering jet contrails that then descended through a nearly saturated atmosphere. |
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| The thick, twisting contrails still prevented any visual sightings. |
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| There were no vapor trails or contrails coming off the craft either. |
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| Sometimes, when we pass very close to or even fly through contrails left by another jet, we can see the twisting motion caused by the jet exhaust which created them. |
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| Much smaller changes in UV radiation are associated with aircraft contrails, aerosols, and induced cloudiness. |
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| Extensive cirrus clouds have been observed to develop after the formation of persistent contrails. |
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| Condensation trails, which are also known as contrails, are formed when airplanes fly at high altitudes, where the air is extremely cold. |
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| When civilian flights over the United States stopped in the wake of the terrorist attacks of September 2001, the lack of sulphur-laden contrails led to a perceptible rise in temperature. |
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| When the sirens wailed and the coastal anti-aircraft guns started to fire, we could only see about two or three contrails seemingly miles in the air. |
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| The skies cleared, revealing a criss-cross of contrails above. |
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| First, this is a rare opportunity for meteorologists and climatologists to study the impact of contrails and contrail induced cirrus clouds on the greenhouse effect. |
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| Such star streams stick out from the rest of the stars in the sky as they are dense and coherent, much like contrails from airplanes easily stick out from regular clouds. |
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| I'd play kerby in the street for hours looking up at contrails stretching across grey slate skies, wishing I was on a plane too, jetting away to somewhere else. |
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