The European Physical Society (EPS) is an independent body funded by contributions from national physical societies, other bodies and individual members. It represents over 100,000 physicists and can call on expertise in all areas where physics is involved. The Position Paper consists of two parts, the EPS position, summarising the recommendations, and a scientific/technical part. The scientific/technical part is essential to the Position Paper as it contains all facts and arguments that form the basis of the EPS position. (i) The objectiv.