With global excess of capital, ultra-long-term bonds continue to emerge. For example, Austria, Argentina, Ireland and other countries have all issued ultra-long-term bonds. Anbound believes that the green bonds issued by Danish companies in the name of environmental protection expire in 3017 as a model to eliminate the virtual growth of global wealth are actually raising permanent funds under the name of earth protection. China, now constantly emphasizes on environmental protection and green development, can learn from this idea.