China's construction industry has experienced a sustained building boom. A rapidly industrializing economy, rural migration to the cities, intensive infrastructure development and the replacement of many obsolete buildings has fueled construction growth. Infrastructure investment is a key element of China's Tenth Five Year Plan (2000-2004), with a special focus on roads, rail systems, ports and airports, and energy. Continued massive infrastructure investment by the Chinese government, high economic growth rates, rapid urbanization and the awarding of the 2008 Summer Olympics to Beijing promise to foster continued growth in urban construction for years to come.