The chapter opens with a discussion of two early instances of global warming cli-fi, Arthur Herzog’s Heat and George Turner’s The Sea and Summer, and argues that both are more or less oblivious to the wider world beyond their respective national frontiers. It proceeds to elaborate an account of the place of SF in the world literary system, understood in Wallerstein and Moretti’s terms as comprising a core, semi-periphery and periphery. This model is then applied more specifically to cli-fi, distinguishing between structural and conjunctural determinants of the evolution of the sub-genre. The main structural determinant, it argues, will be the world SF system. But this may be either countered or reinforced by one or more of three main conjunctural factors: the degree of perceived vulnerability to extreme climate change of any particular national political economy; the salience of Green politics within any particular national polity; and the salience of climate change within broader environmentalist discussions in any particular national culture. The chapter concludes with critical accounts of Kim Stanley Robinson’s Science in the Capital trilogy, Frank Schätzing’s Der Schwarm, Margaret Atwood’s MaddAddam trilogy and Antti Tuomainen’s Parantaja.