Considering the importance of socio-scientific-issues, it has become a necessity to associate teaching sciences and ethics. So, it is relevant to identify tracks which could make this link possible and efficient. This must be done to meet a social expectation which requires that every citizen should be able to take decisions in a complex environment associating scientific knowledge with history, philosophy, economy. The following text relies on conferences and discussions which occured in 2014 on the relation between science education and ethical issues in the secondary school. It's purpose was to present the necessity of this link while giving some practical references and guidelines.