The objective here is to show by a philosophical approach how ecological art contributes to re-qualify environmental times. The basic argument is that one cannot separate the philosophical foundation of problems and the true nature of time, the “Duration” defined by Bergson as a pure intensity underlying all differences in nature. Environmental emergency allows the criticism of time conceived as a spatial dimension, a time that is intrinsically non sustainable. By encouraging a new proximity between art and science, ecological art practices create sensitive tensioning of this criticism in the form of heterochronies – « other » times. The analysis of a number of examples leads to identify three modes of aesthetic expression : i) aesthetics of the ephemeral, cyclic and archaic ; ii) aesthetics of the ongoing, evolving and entangled ; iii) aesthetics of the still, dematerialized and upcoming. The wordings of these different aesthetic modes are identified in a case study, the exhibition-laboratory « The living and its energy » conducted at Inra in Versailles in 2013. This experiment shows the relevance of creating new research situations by forging closer ties between artistic induction, scientific reflection and a philosophy engaged in action. The aim of such practices is to address current mutations of relation to time, their expression in a new aesthetics of Duration and their capacity to sustain an ethics of care by intensity relations.