Transit that uses renewable energy, or zero fossil fuels. Such as walking & cycling. Obviously one can cut beef out of their diet, or go full vegetarian. Stop flying is a bit trickier for people who need to travel around, but high speed trains that run on electricity are a good consideration.
And a lot of travelling can be replaced with video meetings. (Seriously, what is a good term? I was about to write Skype-meetings, but want a general term (in particularly since Skype predictably sucks more and more since MS bought them).)
