Engineering360: "How green buildings help combat climate change"

Sidewall plantings especially, are in relatively small containers. Consequently evaporation is accelerated compared to deep bed or natural earth. We can see this in potted plants at home, and therefore potted plants require maximum watering. Up on a high-rise as shown, wind evaporation is even greater than we see down on the ground. Therefore, this planting method should be prohibited, unless 100% rain storage can be employed to keep these plants alive. Our water supply is in peril generally, getting more expensive, and water too precious these days. There is factored in ROI is insignificant or negative if energy and chemistry to treat and deliver municipal water is factored in. Another 'green' idea that sounds good on the surface.

Allow me to add, properly earth-covered and bermed building methods are excellent energy savers.