摘要:In this article, we present a historical analysis on how Sardinian pastoralism has become an integrated activity in global capitalism, oriented to the production of cheap milk, through the extraction of ecological surplus from the exploitation of nature and labour. Pastoralism has often been looked at as a marginal and traditional activity. On the contrary, our objective is to stress the central role played by pastoralism in the capitalist world-ecology. Since there is currently little work analysing the historical development of pastoralism in a concrete agro-ecological setting from a world-ecology perspective, we want to contribute to the development of the literature by analysing the concrete case of Sardinian pastoralism. To do so, we will use the analytical framework of world-ecology to analyse the historical dialectic of capital accumulation and the production of nature through which pastoralism -understood as a socio-cultural system that organises nature-society relations for the reproduction of local rural societies- became an activity trapped in the production of market commodities and cheap food exploiting human (labour) and extra-human factors (e.g. land, water, environment, animals etc.). Looking at the exploitation of extra-human factors, the concept of ecological surplus allows us to understand how capital accumulation and surplus was possible thanks to the exploitation of nature, or rather the creation of cheap nature and chap inputs for the production of cheap commodities. We analyse historical pastoralism to understand how geopolitical configurations of global capitalism interact with the national and local scales to change pastoral production, nature and labour relations. We will pay particular attention to the role of land and the relationship between pastoralists and animals. The article is based on secondary data, historical material and primary data collected from 2012 to 2020 through qualitative interviews and ethnographic research. We identify four main cycles of agro-ecological transformation to explore the interactions between waves of historical capitalist expansion and changes in the exploitation of agroecological factors. The first two phases will be explored in the first section of the paper: the mercantilist phase during the modern era and the commodification of pastoralist products, which extend from the nineteenth century to the Second World War. In the mercantilist phase, the expansion of pastoralism finds its external limits in the trend of international demand (influenced by international trade policies that may favour or hinder exports) and its internal limits in the competition/complementarity with agriculture for the available land that results in a transhumant model of pastoralism. In this phase, the ecological surplus needed for capitalist accumulation is produced by nature as a gift, or nature for free, which results in the possibility of producing milk at a very low cost by exploiting the natural pasture of the open fields. The second cycle, “the commodification of pastoralist products”, started at the end of the nineteenth century, with the introduction on the island of the industrial processing of Pecorino Romano cheese, and which was increasingly in demand in the North American market. This pushed pastoralism towards a strong commodification. Shepherds stopped processing cheese on-farm and became producers of cheap milk for the Pecorino Romano processing industry. Industrialists control the distribution channels and therefore the price of milk. Moreover, following the partial privatisation of land and high rent prices, shepherds progressively lose the ecological surplus that was guaranteed by free land and natural grazing, key to lower production costs and to counterbalance the unequal distribution of wealth within the chain. At the beginning of the twentieth century, although the market for Pecorino Romano was growing, these contradictions emerged and the unfair redistribution of profits within the chain (which benefited industrialists, middlemen and landowners to the detriment of shepherds) led to numerous protests and the birth of shepherds' cooperatives. The second section of the paper will explore the third agro-ecological phase: the rise of the “monoculture of sheep-raising” through the modernisation policies (from the fifties until 1990s). The protests that affected the inland areas of Sardinia, as well as the increase in banditry, signal the impossibility of continuing to guarantee cheap nature and cheap labour, which are at the basis of the mechanism of capitalist accumulation. On the basis of these pressures, the 1970s witnessed a profound transformation that opened a new cycle of accumulation: laws favouring the purchase of land led to the sedenterization of pastoralism, while agricultural modernisation policies pushed towards the rationalisation of the farm. Land improvements and technological innovations (such as the milking machine and the purchase of agricultural machinery) led to the beginning of the “monoculture of sheep raising”: a phase of intensification in the exploitation of nature and the extraction of ecological surplus. This includes a great increase of the number of sheep per unit of agricultural area, thanks to the cultivated pasture replacing natural grazing and the production and purchase of stock and feed. Subsidised agricultural modernisation and sedentarisation can once again "sustain" the cost of cheap milk that is the basis of the industrial dairy chain. However, agricultural modernisation results in the further commodification of pastoralism, which becomes increasingly dependent on the upstream and downstream market, making pastoralists less autonomous. Moreover, given the impossibility of further expanding the herd, the productivity need of keeping low milk production costs has to be achieved through an increase in the average production per head. Therefore, there are higher investments in genetic selection to increase breed productivity, higher investments to improve animal feeding and a more intensive animal exploitation to increase productivity. These production strategies imply higher farm costs. In this context, the fourth phase, the neoliberal phase (analysed in the third section of the paper) broke out in Sardinia in the mid-1990s. With the end of export subsidies and the opening of the new large-scale retail channel in which producers are completely subordinate, it starts a period of increased volatility in the price of milk. In order to counter income erosion and achieve the productivity gains needed to continue producing cheap milk, pastoralists have intensified the exploitation of both human (labour) and non-human (nature) factors, with contradictory effects. In the case of nature, the intensive exploitation of land through monocultural crops has reduced biodiversity and impoverished the soil. In the case of labour, pastoralists have intensified the levels of self-exploitation and free family labour to extreme levels and have also resorted to cheaply paid foreign labourers. Throughout the paper, we reconstruct the path towards the production of "cheap milk" in Sardinia, processed mainly into pecorino romano for international export. We argue that the production of ecological surplus through the exploitation of nature and labour has been central to capital accumulation and to the unfolding of the capitalist world ecology. However, we have reached a point of crisis where pastoralists are trapped between rising costs and eroding revenues. Further exploitation of human (cheap labour) and extra-human (nature and animals) factors is becoming unsustainable for the great majority, leading to a polarization between pastoralists who push towards further intensification and mechanisation and pastoralists who increasingly de-commodify to build greater autonomy.