As part of the Bali Action Plan adopted in 2007, all contracting parties in industrialized countries agreed to « quantify emission limitation and reduction targets while ensuring comparability of efforts between them, taking into account differences in national circumstances. »  Developing countries have agreed to take appropriate [national] mitigation measures within the framework of sustainable development, supported and made possible by technology, financing and capacity building, in a measurable, rectifiable and verifiable manner. »  42 industrialized countries submitted mitigation targets to the UNFCCC secretariat, as well as 57 developing countries and the African Group (a group of countries within the United Nations).  1. The most important step in addressing the effects of global warming through human activity on climate change was the conclusion of the United Nations Framework Convention on Climate Change (UNFCCC), which was opened for the signing of the United Nations Conference on Environment and Development in Rio de Janeiro in 1992. The convention came into force on March 21, 1994. More than 190 countries, including Turkey and the European Union (EU), are parties to the convention. The convention`s primary objective is to « stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interventions in the climate system. » The parties to the agreement are required to reduce greenhouse gas emissions, cooperate in research and technology, and promote well protection. The agreement is based on the principle of `common but differentiated responsibilities and respective capabilities`, taking into account countries` development priorities, objectives and specific circumstances in order to reduce greenhouse gas emissions. This principle forms the basis of the essence of the climate regime. The principle of « common but differentiated responsibilities » is based on the fact that some countries must assume more responsibility for reducing greenhouse gas emissions, since they emit more greenhouse gas emissions than others after the industrial revolution.