Many airlines now offer their passengers the opportunity to offset the carbon footprint of their flight by participating in reforestation projects, as with Air France, or by supporting the production of sustainable aviation fuel made from cooking oils or fats, as with Lufthansa. These initiatives may seem like greenwashing to some environmental experts, but they resonate with 37% of travelers worldwide. While vacationers are keen to finalize their travel plans for the coming summer, an international study revealed by tour operator Expedia shows the extent to which travelers are aware of the i…