SHANGHAI — With the Shanghai World Expo opening to the public Saturday for a six-month run, China appears eager to catch up with Japan in terms of the quality of its growth to achieve sustainable and balanced economic expansion.

Pointing to the Japan Pavilion in Shanghai, pundits say Chinese visitors should learn from Japan's industry, as well as its energy-saving and environmental protection technologies, as China moves closer to becoming a developed country.

The Japan Pavilion features a futuristic "zero-emission town," a municipality set in 2020 that emits no carbon dioxide through the use of 20 types of environmental technology, including a power-generating window whose glass is covered with clear, thin solar cells, and steelmaking with hydrogen, which would reduce emissions by 30 percent.