Quotes of Marx and Engels on Nature
"large landed property undermines labour-power in the last region, where its prime energy seeks refuge and stores up its strength as a reserve fund for the regeneration of the vital force of nations — on the land itself. Large-scale industry and large-scale mechanised agriculture work together. If originally distinguished by the fact that the former lays waste and destroys principally labour-power, hence the natural force of human beings, whereas the latter more directly exhausts the natural vitality of the soil, they join hands in the further course of development in that the industrial system in the countryside also enervates the labourers, and industry and commerce on their part supply agriculture with the means for exhausting the soil." Capital, Volume Three, Chapter 47.
"Suppose labour-saving machinery, chemical aids, etc., are more extensively used in agriculture, and that therefore constant capital increases technically, not merely in value, but also in mass, as compared with the mass of employed labour-power, then in agriculture (as in mining) it is not only a matter of the social, but also of the natural, productivity of labour which depends on the natural conditions of labour. It is possible for the increase of social productivity in agriculture to barely compensate, or not even compensate, for the decrease in natural power — this compensation will nevertheless be effective only for a short time — so that despite technical development there, no cheapening of the product occurs, but only a still greater increase in price is averted." Capital, Volume Three, Chapter 45