Thirteen concerts in Madrid, more than 700,000 fans, and roughly 700 million euros in combined profit for organisers and the city: Shakira's recently concluded residency in the Spanish capital was a commercial juggernaut. It was also a case study in a quieter problem — the climate cost of hundreds of thousands of people flying in for a single show.

Residencies have flipped the old touring model. Instead of an artist dragging 20 to 50 trucks of stage equipment across continents, fans now travel to one city for a string of dates. That's easier on performers, allows bigger and more elaborate productions, and turns host cities into temporary festival grounds — Shakira's run even included Macondo Park, a 185,000-square-metre cultural complex built around the shows.

The catch is in the ticket data. resale figures show just over half of Shakira's tickets were bought in Spain; the rest came from 117 countries, led by the United States (9%), Germany (5.1%), the UK (4.8%) and France (2.8%), with Colombia, Mexico and Ukraine each above 1%. Travel agency eDreams reported Madrid flight and train bookings jumping between 90% and 146% across successive weekends. Bad Bunny's earlier residency at the Riyadh Air Metropolitano Stadium drew about 640,000 people, 60% of them from outside Madrid.

So what does that mean for emissions? Julian Vogels of Crowd Impact, who surveyed 1,400 attendees at Adele's 2024 Munich residency (ten shows, 750,000 visitors), calculated that audience travel generated an estimated 9,100 tons of CO2e — roughly ten times the footprint of the freight logistics that a traditional tour would have produced. Aircraft, at about 285 grams of CO2 per passenger-kilometre, dwarf cars (55g) and trains (14g), and aviation already accounts for 2.5–3% of global CO2 emissions. Campaign group Ticket to Ride puts fan travel at 40–90% of a major concert's total footprint.

For travellers, the takeaway is practical rather than guilt-inducing. If a residency is your excuse for a trip, how you get there matters more than whether you go. Madrid is reachable from much of Europe by high-speed rail, which cuts per-person emissions dramatically compared with a short-haul flight. And a residency format rewards staying longer: with shows spread over weeks, you can build a proper city break around a concert date rather than a fly-in-fly-out dash. City halls love these events for the hotel and restaurant spending — fans can love them too, just with a train ticket instead of a boarding pass.