[en] Two sets of articles addressing issues related to ecological transition are proposed. The first one addresses general aspects and transverse tools related to governance (governance and involved institutions, ecological transition and other transitions), to law (on climate and on the environment), to technology (development of a low tech), to economy (physical risks and adaptation), and to circular economy (main actors, national strategy, limitations, wastes, waste waters). It also addresses aspects related to natural resources, biodiversity, wastes and pollutions (green energies and metals, food, climate and economy, biodiversity) and to climate change (adaptation and resilience, greenhouse gas emissions and energy). The second part more particularly focuses on the importance of decision processes at a territorial level. This comprises a global approach (safety for ecological transitions within a digital era, sustainable development, ethics and standards), and aspects related to the energy policy, to adaptation policy and to mitigation policy, to economy and to a territorial approach