This chapter delves into current discussions surrounding public engagement with geoengineering, examining the set of methodological and epistemological challenges posed by these emerging technologies to public participation with science and technology, as well as presenting some of the recurring trends stemming from these exercises. The chapter draws on empirical data following a research project on the Anthropocene in Portugal, which included six focus groups and a deliberative forum on carbon dioxide removal and solar radiation management with “situated” publics. The research design underlying these exercises was meant to “politicize” GE debates, emphasizing the performativity and ontological capacity of participatory devices. In the conclusion, the paper calls for the institutionalization of public engagement with GE; the development of a People’s Charter for GE; the enactment of innovative forms of public engagement, arguing that public participation with GE should be taken seriously by decision-makers.