I don't worry about it too much. We all use more carbon than we should in some ways, and hopefully less than others. Aviation, including cargo, accounts for about 2.5% of global CO2 emissions. My leisure travel (usually undersold planes) is a pretty miniscule driver in that small percentage, but is a primary driver of joy and value in my life.

It's awkward to say "it's worth destroying the planet in some small way so that I can enjoy it while I'm here", but I guess it's the truth. I do drive an electric car and run my house off of solar, and am considering buying some carbon offsets to compensate for travel.