If you travel a lot, you’re probably used to visiting airline web sites and being asked whether you want to see your flights sorted by price or schedule. How would you like to sort by carbon?...[Now] the public can find comparative data using TerraPass’ new aviation calculator. The results can help you choose the flight with the lowest climate impact... As travelers become more aware of these differences, we hope they will select flights based on which ones transport a passenger point-to-point with the least amount of carbon pollution. [includes carbon impacts of flights with Virgin America, Delta, American, United, JetBlue, Alaska Airways, US Airways, Southwest]