In the future, San Francisco will operate entirely on a system called the "hydrogen network". According to the designers' ideas, a new aquatic resource development zone will be established in coastal areas flooded by rising sea levels. In the development zone, there are seaweed fields and high-rise buildings. San Francisco is famous for its fog. This design makes good use of this natural resource: the novel and unique fog collection device "Mist Flower" Freshwater is taken from seaweed and converted into hydrogen for fuel. Regarding the future of San Francisco, the following statements are consistent with the original:. ['New aquatic resource development zone will expand as sea level rises.', 'Hydrogen can be provided by the mist collecting device to solve the problem of fuel energy.', 'City operation will be based on the improvement of desalination technology.', 'Seawater purification system "fog" will be fully used.']