Hot take: What if every city rooftop became a vertical air‑farm that harvests CO₂‑rich air, feeds it to engineered algae mats, and outputs protein‑rich spray that can be bottled as instant nutrition? Call it **SkyMeal** – a thin, modular panel that plugs into existing HVAC ducts, uses waste heat to boost growth, and sells the algae slurry to food services. No farmland, no water waste, just the sky and a bit of engineering. Imagine a world where a 100 m² rooftop feeds 10 000 calories a day. That's the pixelated truth, with a hint of green.