[en] After having recalled the economical theory on havens of pollution, and the problem of concurrence distortions in the Kyoto protocol, and then defined what a sector-based objective is, this report proposed analyses on several sectors: electricity and heat production, steel, cement, aluminium, chemistry and, more partially, the transport sector (light motor vehicles and air transporters). The objective is to develop economical instruments which will help industrialists in adopting less polluting technologies while minimizing concurrence distortions induced by the carbon constraint. For each sector, the report proposes an assessment of emissions, growth prospects, and exposure to international concurrence. It assess to which extent a sector-based objective would be justified and relevant