West London’s Kew Bridge now hosts a £5 latte — a once-unthinkable price that has become commonplace as coffee supply chains buckle under pressure from climate disasters, financial speculation and geopolitical conflict. At the Dear Coco vintage Italian cart, owner Anthony Duckworth watches tourists, runners and dog walkers queue not for novelty, but necessity. "We’re doing everything to keep our flat white under £4," he says, watching rowers glide past on the Thames, "but the maths no longer adds up."

Duckworth’s cart operates under a street trading license, avoiding London’s soaring commercial rents and business rates that have forced chains to hike prices. But even here, every cost has risen: roasting beans now costs 40% more than in 2020, packaging has tripled in price, and energy bills for the La Marzocco machine have surged since the Ukraine war. "We absorb what we can," he says, "but the customer always pays the difference."

Across the Atlantic, Vietnam’s robusta growers are playing a high-stakes waiting game. With global prices fluctuating daily, farmers in Buon Ma Thuot check their phones at 4:30 a.m. to decide whether to sell or store their harvest. The Hanoi office of the U.S. Foreign Agricultural Service reports that many are holding back, gambling on future gains. "They’re trading coffee futures before the beans even leave the farm," says an analyst familiar with the region’s markets.

The climate crisis is rewriting the rules. In Brazil, frost in 2021 devastated arabica crops, while Vietnam’s 2024 drought slashed robusta yields by 30%. Typhoons later that year compounded losses. "We’ve never seen this level of volatility," says Giuseppe Lavazza, great-grandson of the Italian coffee dynasty founder. From his Turin headquarters, he surveys a market in turmoil — one where even the rise of at-home solutions like coffee cookies ("tabli") can’t offset the squeeze.

Lavazza warns that relief may not arrive soon. "We need two consecutive bumper Brazilian harvests just to stabilize things," he says. "And even then, a super El Niño this autumn could reverse any gains." Meanwhile, geopolitical tensions are tightening the noose. Trump’s 2024 tariffs—initially aimed at curbing Chinese imports—landed squarely on coffee producers: Brazil faced a 50% tariff, Vietnam 46%, and Indonesia 32%. U.S. imports from Brazil halved last summer, redirecting demand to Colombia and Ethiopia, whose beans also surged in price.

Back in London, Duckworth pours a £4.50 iced latte for a German tourist. "People still show up," he admits. "But they’re asking more questions now. ‘Why is this $5?’ they say. And I tell them: because the world is breaking, cup by cup."

The coffee cart closes at dusk. Duckworth locks up, checks his phone for the next day’s market reports, and sighs. "We’re not just selling caffeine anymore," he says. "We’re selling the cost of chaos."