I calculated my personal carbon footprint in 2009 and was ashamed at the result. I work on restoration of peatlands as part of carbon mitigation strategies, so not so good to see your own footprint dominated by flights. I got invited to a meeting to discuss the carbon impacts of peatland drainage, in Italy, the very next day! It made my choices obvious. I have not flown to any conferences since that day. Indeed, I’ve taken only two work-related flights since then (although I do fly to visit family very occasionally). My choice has limited my research exposure, but it’s been a very small price to pay.