Climate change is global, so it does not matter where CO2 emissions are emitted or saved, in the end it is the sum of greenhouse gases that is decisive. In Germany, the reduction or compensation of CO2 is very expensive, whereas in emerging and developing countries, compensation is cheaper. The Kyoto Protocol, which is binding under international law, therefore stipulates that so-called climate protection projects that avoid or store greenhouse gas emissions should take place where they are most economical. Accordingly, there are many projects in emerging and developing countries, as the potential for savings through new technologies is still very high here and they can be used much more cost-effectively. In addition, the conditions for renewable energy plants (solar, wind, water and biomass) are often much more favourable there. In addition, the projects in emerging and developing countries contribute to improving the economic, social and ecological situation and support the realisation of the United Nations Sustainable Development Goals. For emerging and developing countries, emissions trading is a key driver for the transfer of clean technologies and sustainable economic development.