As a result of this effort, Viet Nam has increased its forest cover since 1990. Nevertheless, the new forests being established in Viet Nam are mainly monoculture plantations with acacia as the main tree crop. Despite this, remaining forests still face challenges. Forest conversion to annual crops and commercial perennial plantations at the household level continue to be an issue in many parts of Viet Nam. In fact, it is interesting that the forest area in Thailand has not changed significantly in the last 15 years.