Carbon Offsets

At the end of a recently-received request that I submit my receipts from a conference trip last week:

... Let me know if you'd like us to purchase carbon offsets for your miles, and deduct the amount (or any amount) from your reimbursement. We’ll do it on your behalf. Thank You! For example: NYC-Chicago round trip = $5.72. Oxford-Chicago round trip = $35.77. Nantes - Chicago round trip = $37.08 Bergen - Chicago round trip = $35.44

A first for me!  Ironically, I spoke on some of my new climate econometrics work with Glenn Rudebusch. (It was not a climate conference per se, and mine was the only climate paper.)