You could always budget for a carbon offset into your budget http://www.climatecare.org/ allow you to pay the equivalent of your carbon footprint into their fund for sustainable projects to offset your carbon emissions.

They even allow for people to buy you an offset for your wedding gift - see here

Offsets emissions for 150 guests and the happy couple's honeymoon flights.
Which is 14.5 tonnes of CO2

Clear consciences all round