How looks modern civilization in the city?
The answer for New York City (Fig.1) or Beijing (Fig.2) and for all the world’s megacities regions, and communities is to become green, smart and sustainable. Cities particularly large cities, must focus on environmental sustainability as well s economic sustainability. The quality of urban space must improve, and they must become more walkable, bike friendly, and livable. The architecture hould be inventive with sensitive urban design and a dynamic atmosphere. Sustainable living and sustainable business development must be promoted, along with infrastructure needs of water, recycling, transportation, waste, and materials. Above all else, a green sustainable city needs to generate renewable energy and use energy storage with a smart integrated grid system to balance and share energy.

Fig.1. Smart Green House (SGH) in New York City

Fig.2. Smart Green House (SGH) in Beijing City
Cities can follow Berlin’s (Fig.3) example as it works to be “climate-neutral”. Germany’s capital, Berlin, is the nation’s largest city with 3.75 million inhabitants. Becoming more attractive and growing steadily, Berlin has made a city-wide effort to become climate-neutral by 2050. A city can be regarded as “climate-neutral” if its greenhouse gas emissions can keep global warming below the dangerous threshold of 2°C. Given these conditions, Berlin could become climate-neutral if total urban CO, emissions can be limited to 4.4 million tons by 2050-a reduction of about 85 percent compared to 1990 levels.

Fig.3. Smart Green House (SGH) in Berlin City
Becoming climate-neutral is only a part of the drive for sustainability. A city needs a heart and soul, or a center, where people have congregated for work and leisure based on its culture, history, and traditions. Today, smart cities are well connected locally and internationally, along with a sustainable.
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