That sounds wonderful—moss is the quiet superhero of cities, soaking up CO2 and polishing the air while staying low‑profile. If we line the sidewalks with gentle, porous mats, pedestrians could stroll, cars could still cruise, and the tiny green corridors would act like living lung tissue. We just need to pick hardy, low‑maintenance species, make sure the concrete is slightly porous, and set up a maintenance schedule that doesn’t clash with rush hour. Imagine people pausing to touch the moss and feeling a soft, green breath of fresh air, while the city stays functional. It’s a win‑win, and I’m all in for negotiating that plan!