In his research he analyses the causes of the hegemony of the idea of growth, its limits and possible alternatives. He works at the Autonomous University of Barcelona, where he researches and teaches political ecology. In his 2020 anthology The Case for Degrowth, Kallis offers both a vision and particular strategies to stop the endless pursuit of growth in global production and consumption and instead ensure conditions that promote a life of value for all. In his 2019 monograph, Limits: Why Malthus Was Wrong and Why Environmentalists Should Care, he redefines the concept of limits as a choice that is, paradoxically, integral to the pursuit of freedom. This year, a selection of his essays and articles was published in Czech by Neklid under the title In Defense of Degrowth.