What are the best of breed practices and concepts that can make our cities much richer in biodiversity than they are currently?

Which urban dweller wouldn't wish to see more greenery all over his or her city! A richer biodiversity can provide significant benefits to cities - health, environmental, economic and even psychological benefits. But with competing aspirations and needs for cities, creating and maintaining such biodiversity is a challenge. What innovative concepts, practices and business models can result in our urban areas having significantly higher biodiversity?

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