An image believed to be that of a hole-punch cloud. Scientists say airplanes create these patterns when they fly through certain types of clouds. The water in the clouds can turn to rain or snow and fall to the ground. H. Raab/Vesta/Wikimedia Commons hide caption

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H. Raab/Vesta/Wikimedia Commons

Snow Delay At The Airport? Blame Planes And Clouds

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Isolation Proves Dangerous On 'Rat Island'

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Marijuana Plants Discovered At National Forest

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White House Pushes For Higher Fuel Efficiency

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A demonstrator uses a slingshot during a protest against a planned high-speed rail line running through the Susa valley in Chiomonte, northern Italy. STR/AFP/Getty Images hide caption

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Anticipating Climate Catastrophe, But With Optimism

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Creating Reservoirs Under Roads And Parking Lots

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Forecasting 'Dead Zone' Conditions in the Gulf

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Valvoline Introduces Greener Motor Oil

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Bob Carter, group vice president and general manager, Toyota Division, introduces the Prius v midsize hybrid-electric vehicle (left) and the Prius C Concept vehicle at the North American International Auto Show in Detroit on Jan. 10. Paul Sancya/AP hide caption

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As Rivals Unveil Hybrids, Toyota Boosts Prius

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An environmental clean water protester participates in a rally at the Pennsylvania state capitol in Harrisburg against the drilling of the Marcellus Shale natural gas formation. Bradley C. Bower/AP hide caption

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Air Quality Concerns Threaten Natural Gas's Image

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Supreme Court Blocks Climate Change Lawsuit

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