The climate law must establish a strong definition of climate neutrality. This definition needs to build on scientific evidence, which underlines the limited remaining carbon budget to stay within the planetary boundaries and thus achieve the targets of the Paris Agreement. Building on these necessities, the law should aim at avoiding emissions rather than on their removal (and use and/or storage) at a later stage. Implementing policies for achieving these objectives requires the removal of remaining barriers for increased energy efficiency and accelerated deployment of renewable energy across all end-use sectors. This will trigger the most cost-efficient pathway towards decarbonisation, and it will help avoid trillions of Euros of stranded investment, which would be inevitable, if investment in fossil resources were not quickly reduced and finally phased out.