Despite several expert statements that the construction of Olympic venues in the buffer area of the UNESCO protected Caucasus Biosphere Reserve and Sochi National Park could be harmful, the IOC approved the plans. Greenpeace of Russia said that the IOC and the Russian Government assumed all responsibility for any damage to the West Caucasus natural UNESCO World Heritage Site. According to the Sochi bid, a wide array of construction was planned in the Grushevyi Ridge area. They included a cascade of hydroelectric power stations on the Mzymta River, sewage treatment facilities, a high-speed rail link, a Mountain Olympic Village, a track for bobsleigh, luge and skeleton (which was relocated in May 2009), and a biathlon venue. Alpine skiing venues were being constructed in the Rosa Khutor plateau and the Psekhako Ridge area. Environmentalists proposed building up Krasnaya Polyana instead of destroying nature reserve sites.