Fungi form mycelial networks that detect pollution gradients and deploy enzymes to break down hydrocarbons at measurable degradation rates, while also supporting plant growth through nutrient transfer efficiency. Floating mycelial mats paired with species like oyster mushroom (Pleurotus ostreatus) absorb and convert toxic compounds into biomass, while mangroves and bivalves add layered filtration to remove heavy metals and microplastics. This creates self-sustaining urban systems that cool cities through evapotranspiration, reduce pollution in water and soil, and continuously expand toward the most degraded areas using heat-driven dispersal.