As my regional focus is Southeast Asia, I fly there from time to time (1-2/yr), but compensate. I do all European travel by train, and try to avoid too many journeys – using Skype, phone, etc.

I would love to see a) compensation as possible and mandatory in national/local travel cost regulations, and, more important b) to include a project carbon budget in project proposals – not necessarily to kick out high-emission projects, but to force scientists to be aware and critical about their own emissions; and c) to make it normal practice for universities to carbon-budget their activities and look for emission reduction potentials.