I work at a university with a huge catering department / residential / retail etc and they have been making strides in reducing there carbon footprint inlcuding rolling out a completely sustainable catering menu 2 new catering restuarants on campus.
we have reuseable boxed lunches
obivously buy local
we compost and donate a portion to a local farm
we do farm to fork events
our plastic silverware are 65% recycled material
u can buy recycled cardboard containers and grab n go containers
we have gone trayless at the school reducing water
we do green n go sustainable grab n go sandwiches, salads, etc
particpate with the farmers markets
we have a "green team" on campus a employee one and a student one (we hold contests to promote a different subject each month to encourage both staff and student to reduce there carbon footprint)
I also used to work for a Bon Appetit B&I and each year they do a local day where they will only serve items purchased within 50 miles of there location and they also have a cool little interactive online tool that tells you what food does the most damage and what not like "does your fish get for flyer miles then you"
you can also get into fairtrade and cage free eggs and the list could go on forever