The aim of this article is to problematise the issue of digital technology in its relation to ecology, both from a conceptual point of view and in terms of identifying the main players who determine its evolution. While trends in the sector show a clear shift towards a rapidly growing ecological footprint, three main concepts and issues stand out: 'green IT', 'IT for green' and 'sufficiency'. The question of lifestyles seems to us to be both decisive and under-problematised.