We present the ENVRI-FAIR approach to consultancy by ICT experts with research infrastructure managers and developers, aimed at technology convergence across the community of environmental research infrastructures (ENVRIs) in order to ensure the production of FAIR (meta)data across the community. We identify three critical areas—(meta)data Catalogue, Syntax and Semantics—in which technology convergence is recommended, and prioritize the FAIR principles for their relevance to the three critical areas. We then present the range of instruments for consultancy at our disposal and how we have used them so far to support ENVRIs in implementing the FAIR principles. First results can be seen in implementation of provenance.