Engineering Sustainability through Language

As our understanding and care for sustainability concerns increases, so does the demand for incorporating these concerns into software. Yet, existing programming language constructs are not well-aligned with concepts of the sustainability domain. This undermines what we term \emph{technical sustainability of the software} due to (i) increased complexity in programming of such concerns and (ii) continuous code changes to keep up with changes in (environmental, social, legal and other) sustainability-related requirements. In this paper we present a proof-of-concept approach on how technical sustainability support for new and existing concerns can be provided through flexible language-level progr amming. We propose to incorporate sustainability-related behaviour into programs through \emph{micro-languages} enabling such behaviour to be updated and/or redefined as and wh en required.