You chose "Flight." 

We know that sometimes flying is unavoidable, but keep in mind that it's the most inefficient mode of transportation. Unless you're launching into low earth orbit aboard Elon Musk's Falcon 9 rocket.

(We'd be very conflicted if ever presented this opportunity...) 

Whenever we fly, we purchase carbon offsets (this reduces your carbon footprint by supporting clean energy). For an average flight across the country, it usually only costs $15 to reduce your flight to zero carbon impact.

Plus, we disembark with a far cleaner conscious than everyone else.