Someone has to pay for the GHG impacts and no matter how you slice it, it comes out of your taxes, or increased costs for everything. All of that is a lot cheaper than the cost of doing nothing. If one choses to fly, I expect a ticket cost for it will be in place. The same for chosing to drive and buying petrol for your truck/car or boat where you will pay at the pump. The commerical cost will just slide into your final bill. Just for fun add up the possible tax on fuel used by aircraft ($10USD/ton is a good guide), then do a search on the cost for extreme weather losses (which is a symptom of GHG) and adaptation. The number of 0's for airplanes will be lost in the sea of 0's for everything else. What many do not register is the insurance companies only cover about 20% of losses. The other 80% comes from government emergency funds - which is you and me.