A worker inspects lettuce plants growing under artificial light and in a liquid solution at China's first computer-controlled greenhouse seedling factory located on the outskirts of Beijing, Aug 27, 2010. The factory will supply 15 million pesticide-free vegetable, fruit and flower seedlings per year to domestic growers, Xinhua News Agency reported. [Photo/Agencies]

A worker inspects lettuce plants growing under artificial light and in a liquid solution at China's first computer-controlled greenhouse seedling factory located on the outskirts of Beijing, Aug 27, 2010. [Photo/Agencies]