"In the current context of climate change and its accompanying adverse effects on natural, human and social systems, the imperative of transitioning to low- and preferably post-carbon societies has become a non-negotiable reality if we want to avoid reaching the point of no return in terms of environmental and climate catastrophe. Such a transition requires that the interests and needs of workers and their communities be taken into consideration to make sure they do not bear the heaviest part of the burden in terms of loss of jobs and means of survival, and that they are prepared to face the new, post-carbon labour environment. The concept of Just Transition was coined to describe both the socio-political project put forward by trade unions in response to climate change, and the recognition by climate activists that the livelihoods and security of workers and their communities must be ensured during the transition to a post-carbon society. However, just transition movements are divided between two quite different orientations, which are labelled “affirmative” and “transformative.” On the one hand, affirmative just transition advocates envisage a transition within the current political-economic system. Transformative just transition activists, on the other hand, envisage a post-capitalist transition. This article, drawing upon an extensive case study of the Portuguese climate jobs campaign, goes beyond showing how these orientations shape the positions taken by union and climate activists. The article also analyses how the conflicts and cooperation between these key actors can shed light on the possibilities and/or limitations of just transition as a framework for the collective action needed to achieve rapid, deep decarbonisation of economies in the Global North context."

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