About 20 to 30 percent of adult men in China are suffering from impotence or other sexual problems, an escalating trend that may be attributable in large part to serious pollution, experts say. In an unrelated development, the Chinese government has unveiled an environmental plan with the aim of reducing pollution levels in the country by 10 percent by 2005. The government plans to gradually phase out industries that are inefficient and highly polluting and encourage cleaner high-tech and service industries. Also, businesses that fail to adopt pollution-prevention technologies and techniques will be fined heavily to give advantage to companies that do adopt more eco-friendly ways.