Namdapha National Park but proved difficult to maintain due to extreme rainfall and frequent landslides. It was also felt that a road would further facilitate wildlife poaching and land encroachment in the National Park. Renovation of the MV road was announced in 2010 and 2013. Culture Lisu villages are usually built close to water to provide easy access for washing and drinking. Their homes are usually built on the ground and have dirt floors and bamboo walls, although an increasing number of the more affluent Lisu are now building houses of wood or even concrete. Lisu subsistence was based on paddy fields, mountain rice, fruit and vegetables. However, they have typically lived in ecologically fragile regions that do not easily support subsistence. They also faced constant upheaval from both physical and social disasters (earthquakes and landslides; wars and governments). Therefore, they have typically been dependent on trade for survival. This included work as porters and caravan guards. With the introduction of the opium poppy as a cash crop in the early 19th century, many Lisu populations were able to achieve economic stability. This lasted for over 100 years, but opium production has all but disappeared in Thailand and China due to interdiction of production. Very few Lisu ever used opium, or its more common derivative heroin, except for medicinal use by the elders to alleviate the pain of arthritis. The Lisu practiced swidden (slash-and-burn) agriculture. In conditions of low population density where land can be fallowed for many years, swiddening is an environmentally sustainable form of horticulture. Despite decades of swiddening by hill tribes such as the Lisu, northern Thailand had a higher proportion of intact forest than any other part of Thailand. However, with road building by the state, logging (some legal, but mostly illegal) by Thai companies, enclosure of land in national parks, and influx of immigrants from the lowlands, swidden fields can not be fallowed, can not re-grow, and swiddening results in large swathes of deforested mountainsides. Under these conditions, Lisu and other swiddeners have been forced to turn to new methods of agriculture to sustain themselves. The Thai Lisu traditional costume shown here is much different from the main Lisu traditional costume being widely used in Nujiang Lisu Autonomous Prefecture, Yunnan, China and Putao, Danai, Myitkyina, Northern Myanmar. Religion Christianity Beginning in the early-20th century, many Lisu people in India and Burma converted to Christianity. Missionaries