Getting rid of airplane contrails could help save the planet

When it comes to vehicles that have a serious impact on the environment, we all immediately think of gas-burning cars and trucks, but passenger aircraft can have a significant impact on the environment as well. One way that passenger jets can impact our planet is in producing those wispy white lines called contrails that we so often see streaking across the sky. Now, a new research effort focusing on reducing the environmental impact of such aircraft has revealed that some very small changes cou...