How close are we to maximizing the green power of our cities? 1%, 20%, does anyone know?
If we start today, by 2050 we may be drawing more carbon out of the atmosphere from our cities than we are inputting. We need to be investigating that possibility as an urgent priority. For example, if we were to plant a lawn over the asphalt jungle in picture four, we would sequester all of the bituminous carbon in the pavement while drawing more down through surface photosynthesis. It is possible.