The question of the environment has been present in revolutionary propaganda since Marx and Engels denounced the unbearable conditions of London in the mid-19th century, taking in Bordiga's exposure of environmental disasters as the result of the irresponsibility of capitalism. Today this question is even more crucial and demands added effort on the part of revolutionary organisations, in order to show that the historic alternative facing humanity - socialism or barbarism - is not only a choice between socialism and the barbarism of war, local or generalised. The danger of barbarism also includes the threat of an ecological catastrophe which is appearing more and more clearly on the horizon.