China 2020: Vision and Challenges - Ecology

What is the nature of ecological governance in China and why is it so important in 2020? China has been talking about pollution for a long time. 
This time seems different. Faced with the grim realities of devastating environmental pollution and degraded ecosystems, and the practical realities of resource constraints, what are China's real-world policies? 
What kind of ecological civilization should China build? 
What challenges or obstacles lie ahead?