AT a glance, there’s nothing extraordinary about the forest on the slope of the Doi Tung mountains, Chiang Rai province. On the plain, 1,100 meters above sea level, green and dense trees fill the view. Only when observed more closely will rows of coffee trees among the other trees be visible, protected from the heat of the sun. Hundreds of thousands of them cover the more than 400-hectare area. “We call this the economy forest,” said Narong