As the United Nations Secretary General has said, it is the major, overriding environmental issue of our time, and the single greatest challenge facing environmental regulators. It is a growing crisis with economic, health and safety, food production, security, and other dimensions.
1.Human increase the emission of CO2.
2.The developing nations are rapidly industrializing.
1.Human stop the growth of emission of CO2.
2.Innovative technology developed to solve the problem.
3.The sense of environmental protection is a trend.