Saudi’s 105-mile desert skyscraper could doom thousands of migrating birds

In the heart of Saudi Arabia’s desert, a futuristic city is rising—or at least, that’s the plan. Known as The Line, this linear, mirrored metropolis is one of the boldest urban visions ever conceived. But while the project promises innovation on an epic scale, its glassy façade may come at a terrible cost for nature: the lives of countless migratory birds that rely on this desert corridor to survive their long seasonal journeys.

An architectural marvel with sky-high ambitions

The Line is part of NEOM, Saudi Arabia’s flagship urban mega-project under the Vision 2030 initiative. Picture a 105-mile-long skyscraper soaring 1,640 feet into the desert sky, sheathed entirely in mirrors, and home to an estimated nine million people. It’s a dazzling concept—straight out of science fiction—and a bold statement of intent from a nation looking to pivot from oil toward sustainable development.

But despite its high-tech green claims, the project is drawing growing criticism from scientists and conservationists. In a place already defined by extremes, The Line risks becoming a deadly obstacle for birds that have flown these routes for millennia.

The mirror in the sky: a lethal obstacle for birds

Saudi Arabia sits along one of the world’s most important avian migratory flyways, a kind of invisible highway in the sky used by billions of birds traveling between Africa and Eurasia. Many of them are small, exhausted, and flying low—especially at night.

Now imagine those birds approaching a 500-meter-high wall of mirrors. They don’t see an obstacle; they see the sky reflected back at them. The result can be fatal.

Even in urban areas like New York or Toronto, glass buildings kill millions of birds each year, according to the American Bird Conservancy. Scale that up to a 170-kilometer-long mirrored skyscraper, and the numbers become staggering. Internal reports have acknowledged some avian loss is inevitable, but for many ecologists, that’s not good enough.

Delays, challenges, and a growing environmental cost

The Line is facing more than just ecological pushback. Construction has been slower than expected, with recent estimates suggesting the city will house only 300,000 people by 2030—far short of its initial goal. On-site progress appears focused on groundwork and excavation, rather than the futuristic modules presented in sleek PR videos.

The disconnect between vision and reality isn’t unusual in mega-projects, but when a development is this massive—and located in such an ecologically sensitive zone—it raises urgent questions. Can you truly build something this disruptive and call it sustainable?

A wake-up call for sustainable urbanism

There’s no denying that cities need to evolve, especially in the face of climate change. But The Line forces us to confront a hard truth: sustainability isn’t just about using clean energy or designing efficient buildings. It’s about how those buildings interact with the natural world—and whether they protect or endanger it.

As someone who’s volunteered with bird rescue organizations during migration seasons, I’ve seen firsthand the damage urban architecture can do. Windows, towers, and lights confuse and kill thousands every year. Most of these tragedies happen quietly, without fanfare. Now imagine scaling that danger up to the size of The Line.

Can innovation and nature coexist?

The ambition behind The Line is undeniably impressive. It pushes the boundaries of what cities could look like—and maybe even how we live. But in trying to leap into the future, there’s a risk of losing touch with the earth beneath our feet—and the skies above.

The fate of this project may ultimately hinge on whether its designers can find a way to balance technological ambition with ecological responsibility. Because progress, if it ignores the cost to nature, isn’t really progress at all.