Just build a dome over the city and be done with it

In a city with dirty air and very little sunshine, why not start building public parks underground? That's the thinking of Shu Yu, deputy director of the Shanghai Urban Underground Space Development Institute, which has already started working on China's first "green park" located beneath the Earth's surface. When do they plan on completing this project? If you said "2010" you are today's big winner.

The China Daily story didn't mention where in Shanghai the underground park would be located (Shu said it would likely be "an existing underground facility"), but they did say that the park will cover hundreds of square meters and will include "grass lawns," "green vegetation" and "winding streams."

Shu also said it will "resemble a normal park above the ground." So that means no dogs or humans allowed on the grass.

The architects did admit some technical obstacles needed to be overcome: "such as adequate water supply and sunlight."