Saudi Arabia

By 2100, sustainable tourism in Saudi Arabia is unlikely to resemble either the glossy renderings of its current Vision 2030 marketing or the dismissals of its sceptics. The more plausible outcome is a forced bifurcation of the kingdom's tourism geography, mediated by sovereign artificial intelligence, expensive to engineer, and decided in significant measure by choices made during the next decade. The interior pilgrimage core and the eastern coast will become intermittently uninhabitable in summer; the northern Red Sea and the southwestern Sarawat highlands will inherit the leisure economy; and the Hajj itself will run a periodic gauntlet against the lunar calendar's slow rotation through the hottest months of the Gregorian year.

The Arabian Peninsula warms roughly 1.5 to 2 times the global mean, and downscaled ensembles place end-of-century summer warming over the Saudi interior in the range of 5 to 7 degrees Celsius above the 1981-2010 baseline under a middle-of-the-road emissions pathway, and beyond 6 degrees across most of the interior under high-emissions trajectories. The Persian Gulf coast — Dhahran, Khobar, Jubail, Dammam — sits closest to the threshold at which wet-bulb temperatures briefly exceed the limit of human survivability without artificial cooling, a possibility that becomes a recurring summer feature on the most pessimistic pathway. The Red Sea coast, moderated by sea-surface damping, warms more slowly and stays below that strict survivability ceiling, though still well into extreme-danger territory. The Asir mountains, with peaks near 3,000 metres, hold summer maxima 10 to 15 degrees cooler than Riyadh and emerge as the kingdom's single most climate-defensible mass-tourism geography.

This climate envelope reshapes tourism into three regimes. The interior — Riyadh, Diriyah, Qiddiya, AlUla — collapses into a winter-only outdoor season running roughly October through March, with summer trade pushed indoors into engineered, heavily cooled venues. The Eastern Province becomes the kingdom's most climate-exposed tourism region; its underrated industrial-era heritage at Dhahran, the Ithra cultural centre, the date-palm oasis of Al-Ahsa, and the antiquities of Tarout will require progressively more aggressive cooling infrastructure to remain accessible at scale. The Red Sea coast and the Sarawat highlands together form the year-round leisure spine.

The Hajj is the singular pressure point. In 2024 the pilgrimage killed at least 1,301 people, the great majority of them unauthorised pilgrims, in temperatures that touched 51.8 degrees Celsius at the Grand Mosque and exceeded 50 degrees across the Mina and Arafat sites. Because the Islamic lunar calendar drifts about eleven days earlier each Gregorian year, the Hajj cycles through every season roughly every 33 years. The kingdom is now leaving one summer-Hajj window and will enter a cooler interval through the 2030s and 2040s before returning to severe summer conditions in the late 2050s and again in the early 2090s. Published projections of wet-bulb stress during those windows place pilgrims well past the threshold for extreme danger; the 2024 disaster arrived earlier than even those projections anticipated. The implication is that the kingdom has two clear summer-Hajj cycles in the century ahead to engineer its way out of catastrophe, and the toolkit it builds during the cool interval — cooled tent cities at Mina, full envelope cooling of the Mataf, biometric heat triage for at-risk pilgrims, AI-orchestrated crowd flow, and bilaterally negotiated quotas that account for age, health and country of origin — will determine whether those cycles are survived by design or punished by mass casualty.

This is where sovereign artificial intelligence enters the story, though not always as the rescuer the marketing implies. HUMAIN, launched in May 2025 and wholly owned by the kingdom's sovereign wealth fund, consolidates Saudi AI ambition into a single full-stack national champion with data-centre build-out targets of nearly 2 gigawatts by 2030 and 6 gigawatts by 2034. It is also the only credible technology stack for orchestrating heat-stressed Hajj, monitoring 1,800 kilometres of Red Sea reef, and delivering multilingual heritage interpretation at the scale the kingdom imagines. At the same time, data centres at the gigawatt scale consume electricity and water at volumes comparable to mid-sized Saudi cities, and the obvious thermodynamic move — siting hyperscale facilities on the Red Sea coast with seawater cooling — competes directly with reef preservation through brine and thermal discharge. The kingdom's Green Initiative target of 50 percent renewables by 2030 is at the ambitious end of credibility, and meeting it is effectively necessary just to keep AI-mediated Saudi services within reputational reach of European carbon-border-style regimes.

The demographic picture is unusual. The kingdom belongs to a small group of countries — alongside the United Arab Emirates, Oman, Canada, Australia, and the United States — projected to grow by more than 20 percent between 2024 and 2100 primarily through immigration. The medium-variant 2100 population sits in the 40 to 50 million range, with a Saudi-national to expatriate split that, at the 2024 census, was already closer to 58 percent to 42 percent than to the older two-to-one framing. Tourism's hospitality workforce will remain structurally expatriate even under aggressive Saudisation, with the more plausible path to Saudi private-sector employment running through AI displacement of mid-skill expat roles — front-desk reception, multilingual concierge, kitchen-prep automation, scheduling — rather than wholesale ethnic substitution. The macroeconomic implication for sending economies in South Asia, Egypt, the Philippines and the Horn of Africa is non-trivial: remittance flows from Saudi tourism work are AI-disruption-exposed.

The map of viable destinations is already legible. AlUla, with Hegra at its centre and high-desert winter climate on its side, is one of the few destinations credible at year-round scale through any plausible 2100 climate pathway; the Royal Commission's stewardship has been substantively careful and its archaeological collaboration internationally serious. The Asir highlands offer the climate-resilient mountain-tourism geography the kingdom has only recently begun to develop, anchored by Soudah Peaks and a rich Tihama-Asir cultural complex of painted houses, terraced agriculture and distinctive endemic ecology. Uruq Bani Ma'arid in the Empty Quarter, inscribed in 2023 as the first natural Saudi UNESCO site and added to the IUCN Green List in 2025, anchors a flagship low-impact desert tourism asset whose binding constraint is carrying capacity rather than infrastructure. Eight UNESCO sites including Al-Faw, inscribed in 2024, now anchor the cultural map. Historic Jeddah's coral-stone Al-Balad district sits at elevations of two to eight metres and is manageable under the central sea-level rise projection of roughly 0.4 to 1 metre by century's end, but its long-tail exposure to ice-sheet contributions is real and argues for adaptation planning sized to the upper envelope rather than the central estimate.

The northern Red Sea inherits a globally anomalous coral refugium in the Gulf of Aqaba and adjacent central-northern Red Sea, where reefs survived 2024's record marine heatwave without mass bleaching. This refugium is partial, gradient-dependent and conditional on local stressors being tightly managed — desalination brine, construction sediment, cruise traffic, and the discharge engineering of any coastal data-centre cluster. The southern Red Sea reefs, by contrast, are already showing severe heat damage. The giga-project megacities along this coast have been quietly resized over the past year: The Line has been reduced from a 170-kilometre megacity to a stadium-scale segment, Trojena's winter games are postponed, Sindalah is open three years late, and construction commitments across the portfolio have been roughly halved. What remains is more modest, more credible and less reliant on demographic miracles: a working set of Red Sea resorts, an active Diriyah and Qiddiya, an AlUla on a measured trajectory, and a Soudah build-out on a decade-plus horizon.

The most-likely outcome at the close of the century is therefore a kingdom whose tourism geography has bifurcated cleanly. At one pole sits an engineered pilgrimage and indoor-leisure complex — Mecca, Medina, the cooled Mataf, Diriyah Gate, Qiddiya, Ithra — orchestrated by sovereign AI and operating in summer behind heavy climate envelopes. At the other pole sit the year-round outdoor experiences of AlUla, Asir, Uruq Bani Ma'arid, and the northern Red Sea. A population of perhaps 40 to 50 million, with an unusually large immigrant share, will staff and visit this system; an AI-augmented but smaller hospitality workforce will mediate it; and the kingdom will export AI compute and heritage-trained models alongside oil and pilgrimage services. None of this is foreordained. The decisions made between now and 2035 — on Hajj engineering, on renewable build-out, on data-centre siting, on coral-reef stress management, on dialect coverage in national language models, and on revenue-sharing with the communities whose heritage feeds those models — will determine whether the second half of the century is a managed transformation or a series of avoidable failures.