3. Fly economy.
If you book an economy ticket, not only will you be saving money on the flight, but you'll be in a higher class of eco-friendliness than passengers in business and first. A 2013 study by the World Bank found that, when compared to an economy ticket, the carbon footprint of a business-class passenger is three times greater, and first is nine times higher. So go on, suck it up and sacrifice a little legroom for the greater good.
WHAT'S NEW: There are a few perks for economy passengers. In March 2015, Jetstar began offering Ecothread blankets, by Buzz Products; the cozy fabric looks and feels like polar fleece, but is made entirely from plastic bottles. You can upgrade your own in-flight experience with House of Marley's over-ear headphones. The brand uses upcycled fabric, recycled bottles, organic cotton, reclaimed hemp and ethically sourced wood to craft a chic audio experience that doesn't compromise on sound. Proceeds from the headphones help fund 1Love, a foundation that supports environmental causes around the globe.