The radical dream of a deus ex machina to achieve what they fear they can not, the destruction of capitalism, lives on.
Marx was sceptical of the argument that discovered the limit to capital accumulation in *nature* when it ought to look for such barriers in the system of capitalist production.
"economists like Ricardo, who take the capitalist mode of production as an absolute, feel here that this mode of production creates a barrier for itself and seek the source of this barrier not in production but rather in nature". (Capital, vol. III, p. 350).