Coffee's bitterness makes sweet addition to farmers' incomes

Forty-four-year-old Zhao Jiadong prefers his coffee served black.

"People like us who have gone through a bitter life no longer feel bitterness on the tongue," said Zhao, a coffee farmer in Mangshi, in the Dehong Dai and Jingpo autonomous prefecture of Yunnan province, bordering Myanmar.

Zhao is one of some 300,000 in Dehong. Nearly 98 percent of the coffee beans in China are grown in Yunnan.