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Quick answer：Roof-top greening refers to the practice of cultivating plants on the roof of buildings. It is an environmentally friendly and sustainable approach that provides numerous benefits such as improving air quality, reducing energy consumption, and providing additional green space in urban areas. A 'roof top greenery library' could be a collection of resources, designs, and information related to the topic of roof-top greening, aimed at educating and inspiring individuals and organizations to implement this practice.
