A policy slogan most fully defined in Central Document No. 12 (April 2015). At the 17th National Party Congress (2007), Hu Jintao 胡锦涛 added it to a long-accepted series of spiritual, material and political 'forms of human civilisation'. In this one, the natural environment is respected and safeguarded. A reform plan for 'building an ecological civilisation system' was eventually issued in September 2015, targeting improvements in the existing system, and a balance between economic development and environmental protection.