In the 1990s, China started trading more with the world and it opened up the country to foreign businesses. Since then the Chinese economy has boomed, and it is now the second largest in the world after the USA. They have been using a lot of this new wealth to build cities and infrastructure for over one billion citizens! The new Hong Kong sea crossing is the latest in a string of awesome construction projects in the country.
China already has the longest bridge of any kind in the world – a 164km bridge that crosses land and water between Shanghai and Nanjing. It also has the longest motorway tunnel, which travels 18km underneath Zhongnan Mountain, near the ancient city of Xi’an.
All of this construction takes its toll on the environment, however, and many of China’s cities are choked with smog. The Chinese government has been encouraging green energy to help reduce air pollution. The Three Gorges Dam is the largest hydroelectric dam in the world, and China also has the world’s largest solar farm. In just four years, they built four million solar panels there!