Environment activists in Cambodia protest against the Don Sahong hydropower dam on Sept. 11, 2014 in Phnom Penh, Cambodia. World Wildlife Fund (WWF) held a public event in the capital city of Cambodia on Thursday to share the concerns of more than 250,000 people who are calling on Mega First Corporation to suspend construction of the controversial 260-megawatt Don Sahong hydropower project on the Mekong River in Laos. (Xinhua/Phearum)