With population growth and economic development，a number of new international conflicts have been triggered by environmental issues. As one of the severest non-traditional challenges facing human society in the 21^st century，climate change has caused long-term，multi-level and irreversible problems endangering environment security，which need transboundary cooperation from international community，especially those joint efforts based on mutual trust. Climate change will bring negative effect on and beyond ecology and environment，and further，posing challenges for traditional security and resource scrambles，which make it necessary for global governance.