30, 2016, and compensations were disbursed to affected parties accordingly. Other environmental issues in Vietnam Over the course of the history of the environmental movement in Vietnam, different types of issues have come to the fore at one time or another: Conservation of Hang Sơn Đoòng cave: Similar to the preservation of Hanoi's Reunification Park mentioned earlier, the environmental movement in Vietnam has come out to oppose the proposed plans for building a cable car, at a cost of between $112 and $211 million, through the cave, located in Phong Nha-Kẻ Bàng National Park, and considered the world's largest cave (by volume). Air pollution: Due to increased vehicular transportation, industrial activities, solid fuel burning and poor urban planning, air pollution, especially when measured by the concentration of PM2.5 particles in the air, is becoming an environmental issue of significance in big cities such as Hanoi and Ho Chi Minh City, which are now among the top polluted cites in South East Asia. One possible way to address this environmental issue is through the development of renewable energy solutions such as solar and wind power which have the potential to reduce air pollution. Furthermore, citizens' demands for action on air pollution are an important factor in the government's choice to reduce emissions. Accessibility to clean water. Vietnamese citizens generally have high levels of freshwater accessibility, although there is some variability between larger and smaller cities, and between cities and rural areas. Tap water is a readily available water supply in large cities such as Ho Chi Minh City and Hanoi. However, in rural areas, hand-dug wells remain the most important source of water as 39%-44% still rely on it. Only 10% of the rural population is supplied with piped water. Like air pollution, water pollution levels are also increasing due to increased industrial activity, especially in the Mekong Delta. In a region where most people depend on the surface water of the river, this environmental issue has had human health consequences, such as high rates of diarrhea. Overall in Vietnam, the number of reported diarrhea diseases was 296000 in total in 2009. Other examples of waterborne diseases in Vietnam include cholera, typhoid fever, dysentery, and hepatitis A. Reported cases of cholera is still significantly high. Caused by drinking water contaminated by bacterium, the number of reported cholera is well above 500, reaching 1900 in 2007, and 600 in 2010. However, the