According to the World Wildlife Federation (WWF), an estimated 14% of worldwide greenhouse gas emissions can be attributed to travel. If you travel as frequently as I do, perhaps somewhere mid-flight over the middle of the Atlantic, you’ve had an overwhelming sense of guilt as you realize that in order to hurtle yourself to your destination in a timely fashion, you quite literally will contribute tons of carbon into the atmosphere. And yet, as you recline in your seat to watch your third movie of a trans-Atlantic flight, any of the guilt you might have felt somehow disappears as you wonder, well, how else am I going to get there?