However, some studies in language ecology refer only to language within a social context and disregard the ecological context of the living ecosystems and physical environment that life depends on, so could be considered to be more sociolinguistic in nature. Tove Skutnabb-Kangas and David Harmon (2018) write that "There has been a tendency of many sociolinguists to pay only lip service to the literal sense of ‘ecology’ and to focus only on social concerns. They see the ‘eco-’ in ecolinguistics/language ecology as a relationship within and between various languages, speakers of these languages and their sociocultural and economic contexts.".