As public awareness of composting models grows, a new vision is emerging.
Energy, water, food, materials, nutrients enter urban ecosystems and leave as emissions and waste. Here's how can cities turn this situation around.
With the constant turnover of land, many American cities are facing legacy hazardous waste that they didn't even know was there.
As city populations continue to grow, city governments must manage ever-increasing demands, consider trade-offs between differing values, and achieve their goals with limited capacity and funds.