Vietnam is the epicenter of robusta production, funded at a furious pace by the big corporate coffee buyers, which helped create the "coffee crisis" (more background on the coffee crisis here, with many links). Forests are cleared for these sun coffee monocultures. More than 182,000 acres of forest have been cleared in Dac Lac province alone; water shortages and soil erosion have been problems in coffee-growing areas.

A small percentage of the crop is arabica, and there is some effort to increase that percentage. It's difficult to recommend Vietnam coffees if one is concerned about biodiversity, considering that forest may still be cleared for arabica coffee start-up plantations. It's a tough call, because encouraging sustainable practices in this country facing difficult times could be beneficial.