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The encyclical Laudato si’ invites us to an “ecological conversion”. Other magisterial texts had preceded it on this path, marking what Adolphe Gesché described as a “cosmocentric turning point” in contrast to the “anthropocentric turning point” (Karl Rahner) characteristic of Vatican II. This double turning-point explains why, despite early warning signs of environmental degradation and of human responsability, the Catholic world, later than the Protestant world, perceived the need for a change of attitude. In addition, this raises the question of the place of the human amidst the world according to God’s creative plan. Talking of conversion presupposes a reversal and a shift towards God, but towards a God who confers on each creature a “value of its own”.