  To keep current global warming below 1.5{\deg}C compared with the
pre-industrial era, measures must be taken as quickly as possible in all
spheres of society. Astronomy must also make its contribution. In this
proceeding, and during the workshop to which it refers, different levers of
actions are discussed through various examples: individual efforts,
laboratory-level actions, impact evaluation and mitigation in major projects,
institutional level, and involvement through collectives.
