The planned design for The Line in Neom.NeomSaudi Arabia wants The Line to be a high-tech "eco-city."Officials say the city will have no cars or emissions and run on 100% renewable energy.However, architects and other experts have questioned its sustainability and ecological impact.Neom's flagship city, known as The Line, has grand plans to be a futuristic "eco-city."Officials say the linear city will be built between two giant mirrored skyscrapers, each 1640 feet high and 656 feet apart, and be free of roads, cars, and emissions.While plans for The Line have baffled architects and designers, Saudi has continually touted the project as one of the most sustainable in the world.It's part of Saudi ruler Mohammed bin Salman's Vision 2030 plan to reorient the country's economy away from fossil fuels, which are the source of its wealth, toward innovation, technology, and tourism.Even the unusual materials used for The Line aim to foster a sense of coexistence with the natural world."With a mirrored facade, wherever you are looking you will see the land behind you, which will be a natural environment.