"Even a whole society, a nation, or even all simultaneously existing societies together, are not the owners of the globe. They are only its possessors, its usufructuaries, and like boni patres familias [good fathers of families] they must hand it down to succeeding generations in an improved condition... The rational cultivation of the soil as eternal communal property", is "an inalienable condition of the existence and reproduction of a chain of successive generations of the human race."
— Marx, Capital, vol. 3

"It seems to me axiomatic that the expansionary, competitive and exploitative logic of capitalist accumulation in the context of the nation-state system must, in the longer or shorter term, be destabilizing, and that capitalism . . . is and will for the foreseeable future remain the greatest threat to world peace." Capitalism "may be able to accommodate some degree of ecological care, especially when the technology of environmental protection is itself profitably marketable. But the essential irrationality of the drive for capital accumulation, which subordinates everything to the requirements of the self-expansion of capital and so-called growth, is unavoidably hostile to ecological balance." — Ellen Meiksins Wood