The Citybuilding- A whole City in one building

Imagine the future… a world that is almost burnt. Human beings then live in huge buildings that contain whole villages and citys. Those buildings include everything human beings need to stay alive such as fields for growing food and anything else you can find in citys and villages nowadays. Even the facade consists of photovoltaic panels. It is only possible to leave the building in suits that are similar to space suits because the air will be as dirty as it is impossible to breathe outside. So that`s life in the future. The whole Citylife in one building. Instead of citys with many houses there will then be one huge building replacing each city.