Since the middle of the 20th century, the earth and climate systems have changed dramatically. The average global temperature is rising, leading to an increase in extreme weather conditions and a decline in biodiversity. This is caused mainly by the human induced increase in the concentration of CO2 and other greenhouse gases in the atmosphere. In Germany, this has led to the demand to do more to combat global warming. This is associated with the idea that a strong reduction in German (and European) CO2 emissions can curb climate change and prevent its “worst consequences”. This is an illusion, because the previous climate agreements of Kyoto and Paris could not and cannot prevent a sharp increase in global CO2 emissions. Climate change will continue. In Germany, a rethink is necessary.