Over the past 30 years, local people in Dali, southwest China's Yunnan Province, have worked tirelessly to transform Erhai Lake's waters from murky to crystal clear. Now, with the thriving tourism, they worry the lake may face fresh challenges. He Licheng, a Dali resident, wonders how the city can balance environmental protection with tourism and agriculture to ensure a sustainable future for Erhai Lake. Wu Changhua, chair of Governing Council of Asia Pacific Water Forum, answers his question and sheds more light on the collective effort of government regulations, local communities and tourists.