This thesis develops a novel concept in climate change communication: Holocene-Anthropocene blends. The thesis is fundamentally about the relationship between units of human culture and the aspects of nature they are premised upon. On the one hand, the research suggests that, because elements of culture, think of metaphor for instance, are often based on aspects of nature, when those aspects of nature change, the metaphors premised upon them are rendered anachronistic. These elements of culture, which I term ecocultural anachronisms can then be leveraged to communicate climate breakdown in a compressed and compelling way. At the same time, the research suggests that many aspects of nature – Summer for instance, or sea ice – that have relatively stable cultural connotations in particular cultural contexts take on entirely new meanings as they are fundamentally altered by climate breakdown. The result of this is that these aspects of nature become bisociated. It is possible, for instance, to think of a conventional cultural model of Western summer in which it is the season of romance and joy. At the same time, because of increasingly common periods of extreme heat, drought and forest fire, a novel, negative cultural model of summer is emerging. In this novel model, summer is a season of discomfort and danger. The co-existence of these two cultural models (and summer is just one example) again offers climate communicators an opportunity to leverage this emerging polysemy. This research studies these ideas of ecocultural anachronism and bisociation through the framework of conceptual blending theory. It also studies instances of climate communication that leverage these dynamics in order to understand how they work. The research also introduces a number of novel previously undocumented emerging metaphors which are based on aspects of nature that have emerged as a result of climate breakdown. This is further evidence of the ways in which climate breakdown can be seen at the level of cultural concepts. This thesis also demonstrates practical applications where I put a number of the insights and dynamics identified in the research into real-world use in order to further explore how they work and as further demonstration of their usefulness to climate communicators.