The Carbon Ledger
Accounting has one core rule: every debit needs a credit. Nothing sits unreconciled. As an LSE Accounting and Finance student on exchange to Bocconi, I plan to run my year abroad like a set of books. The metaphor is on the nose. I know. It is also the only frame I trust.
The debit column is honest. Flying to Milan Malpensa is the fastest way there and the worst thing I could do for the balance. Landing compounds the problem: the Po Valley is one of Europe’s most polluted airsheds, with PM2.5 sitting far above WHO guidance and Milan repeatedly ranking among Europe’s worst cities for air quality (Airly, n.d.). A “sustainable exchange” cannot skip past that. Milan spends its winters trapping smog under an alpine inversion, and I refuse to add another idling engine to the basin.
So the credit column is where the work happens.
First entry: I am taking the train. Eurostar to Paris Gare du Nord, then a Trenitalia Frecciarossa through the Alps to Milano Centrale. Independent research commissioned by Eurostar found electrified rail cuts emissions by roughly 90 percent on comparable European routes (Seat61, n.d.). I have priced the route on Trainline and cross-checked my journey on EcoPassenger.org. Twelve hours to read and work instead of queueing at security. I’d call that a bad flight and a very good day.
Second entry: no car. Milan is flat and thick with tram lines, and my commute to Bocconi will run on ATM’s electrified metro and trams and on BikeMi, whose pedal-assist bikes recharge from solar panels at the operator’s depot (Comune di Milano, n.d. a). Area B, the citywide low-emission zone, already restricts older diesels across most of Milan (Comune di Milano, n.d. b). Using that system feels closer to citizenship than tourism.
Third entry: what I eat and buy. I already grow vegetables at home in London, so shopping Mercato di Wagner instead of importing British staples feels less like a sacrifice than a translation. I will use Too Good To Go to rescue surplus food from Milanese bakeries, and skip the fast-fashion shops on Corso Buenos Aires when a repaired jacket does the same work.
This maps onto UN SDGs 11, 12 and 13, but frameworks are cheap. The number that matters is whether my ledger closes closer to zero than it would have done by default.
Auditors have a phrase for accounts that look tidy but hide the losses: window dressing. Sustainable travel has the same problem. Offsetting a flight is not the same as not taking it. I’d rather post a smaller, honest number than a laundered one. My year in Milan will read as truthfully as I can make it.
References
Airly (n.d.) ‘Why Italy’s Po Valley still struggles with smog’. www.airly.org/en/why-italys-po-valley-still-struggles-with-smog
Comune di Milano (n.d. a) ‘Bike Sharing’. www.comune.milano.it/en/servizi/mobilita/bike-sharing
Comune di Milano (n.d. b) ‘Area B’. www.comune.milano.it/en/argomenti/mobilita/area-b
Seat61 (n.d.) ‘CO2 emissions: Train & ferry versus plane’. www.seat61.com/CO2flights.htm
