BEIJING - Alarmed by the vaulting ambitions of many Chinese provinces to grow at all costs, China's top economic chief is calling on officials to calm down and spare a thought for the environment.

Zhang Ping, who heads China's National Development and Reform Commission, the central economic planning agency, said only five or six of China's 30 provinces are targeting annual economic growth of 8 or 9 percent.

The remaining provinces are aiming for growth rates of more than 10 percent this year, with some wanting to double economic output in the coming five years.

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"China has a planned energy supply of about 4 billion cubic tons of coal equivalent for the next five years, and this is not enough to meet demands for economic growth to double," he was quoted as saying on the news portal Sina.com.

Beijing is increasingly?concerned with?the ambitions of Chinese provinces across the country to chase high growth despite the central government's pleas for a more moderate and sustainable pace of expansion.

Years of?rapid economic growth have taken a toll on China's environment, with Beijing trying to undo some of the damage now. It has an annual growth target of 7 percent for the next five years, well down from last year's 10 percent.

Zhang said Beijing has asked local governments to take into account the supply of "energy, environment, water and land" to set more reasonable growth targets.