In general, green roofs with a mosaic of habitats are great for invertebrates. These include open grassland, wildflowers and areas of bare ground. The open areas warm up in the sunlight ... In winter, ...

However, an alternative view is that urban design is best initiated from the ground ... from the top of these cities is characterized by intentional patterns of roads, blocks, and green spaces.

While owners consider project costs in dollars and cents, “carbon cost” adds another standard to how they can think more green, he says.