Once you're back at home, even if you feel you've treaded lightly, there's still more you can do.
"Offsetting your flight is a quick and easy way to green your trip," Bennett said.
The basic idea is to compensate for your carbon footprint by enabling an equivalent reduction in greenhouse gas by donating a carbon offset coupon. Options range from investing in wind energy to planting trees. Prices range accordingly depending on the scheme.
Though carbon offsetting has its critics, it is still a responsible way to give back. Two well-known organizations that can help guide your donation are ClimateTrust.org and NativeEnergy.com.
Bennett also recommended re-investing in your favorite destinations to ensure their future.
"Look for charities or foundations that invest in the place and medicate the impact of tourism on it," he said. "Make a donation, or volunteer to help on your next trip."
Click here to visit the National Geographic Center for Sustainable Travel.
Click here to visit Context Travel.
Click here to visit Olivia Zaleski's blog on the Huffington Post.
Click here to read more about green lifestyle options in National Geographic's Green Guide.
Click here to learn more about vampire energy waste from the Department of Energy.