The present application relates to a production plant comprising - a synthesis gas generation step (1) arranged to receive a hydrocarbon or carboneous feedstock (2) and in a synthesis gas generation process provide a syngas, - a production step (4) arranged to receive the syngas and produce a product stream (5), - a reverse water gas shift step (4) arranged to receive a H2 rich gas stream (7) and a C02 feed (8) and in a RWGS step obtain a reverse shifted gas stream (9), and - means (10) for adding said reverse shifted gas stream (9) to the synthesis gas stream (3).