If the future city wants to be more optimized and livable, the ecological environment should be put in the first place, and urban greening is the first choice. Undeniably, at present, all major cities are carrying out urban greening work such as building forest parks, adding green belts and green spaces, but they all ignore the roofs of buildings accounting for two-thirds of the urban area to varying degrees. Actively developing roof greening is the development and utilization of this potential ecological resource. The ideal state of the future city is that the city is in the garden, not the garden is in the city. If a city uses all the roofs for greening, systematically distributes the green on the buildings, and brings the whole city into the embrace of nature, then everyone can feel the breath of nature.

In a conservation-oriented society, because there is no land cost, it is the cheapest way to increase green space in downtown areas. In the future, flowers and plants can be planted on it, and crops such as rice, vegetables and fruits can also be planted, which has ecological benefits and can also eat safe food, which has good economic benefits. In this way, the future cities may have special rural scenery, and the roofs may become green "farmland". This new type of landscaping not only improves the coverage rate of green vegetation, but also is of great benefit to heat insulation, noise elimination, wind prevention, air purification and reduction of urban heat island effect in big cities. And there is no need to worry about irrigation, because the "roof garden" has the function of collecting rainwater, and the rainwater left behind can be effectively used, which is a veritable water-saving irrigation.

In the future city life, you don't have to walk so far to the park, you can relax and enjoy the cool without leaving home, go back to the roof garden at home after busy work, and rest and adjust in a quiet and comfortable atmosphere. If urban roof gardens can be popularized, perhaps the sky will be bluer, energy saving and medical expenses will be reduced, and society will be more harmonious.

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