China Q4 GDP growth to slow on debt, pollution clampdown

China's economic growth is expected to have slowed slightly in the fourth quarter from the previous quarter, a Reuters poll showed, as the government extended a crackdown on debt risks and factory pollution.Policymakers in the world's second largest economy have been trying to contain financial risks and slow an explosive build-up in debt without stunting economic growth.The poll of 61 analysts showed growth in gross domestic product likely slowed to 6.7 percent on a year-on-year basis, down fro