Cities are beginning to assert themselves as internationally relevant actors. This is particularly noticeable in the climate change context. This development has so far not been accorded a great deal of attention by international lawyers. The review essay discusses four new books by political scientists which offer us a closer look at the political dimension of ‘global cities’, a term originally coined by sociologist Saskia Sassen. The four books under review as well as this essay pay particular attention to the C40 association – a movement of self-styled city leaders in climate change governance. This group of cities has developed numerous ties with international organizations and private corporations.