By the middle of the 21st century, it will probably be one to two degrees Celsius warmer than it is today. The Intergovernmental Panel on Climate Change assumes that the earth could even heat up by up to 5 degrees Celsius by 2100. Climate change has a complex impact on humans and nature: extreme weather events such as heavy rainfall or heatwaves will occur more frequently as a result of the higher earth temperature. In addition, melting ice caps are expected to cause sea levels to rise by up to one meter by 2100. Flooding, devastation, food shortages and species extinction are also direct consequences of global warming. In addition, access to clean drinking water will become increasingly precarious. As a result, climate-related migration movements are becoming a global challenge. In view of these prospects, climate researchers are calling for swift action: If we reduce our CO2 emissions by 40 to 70 percent by 2050 and to zero by 2100, global warming can still be limited to 2 degrees Celsius.