The mechanisms behind galaxies moving away from the main sequence of star formation towards a starburst mode is one of the holy grails of galaxy evolution, with gas mass (Mgas) estimates offering a crucial insight into this critical open question. To this end, dust emission can act as one of the Mgas tracers. In this talk I will introduce a novel SED fitting technique for near-IR to (sub)mm photometry, which relies on the linear combination of a subset of pre-selected stellar, AGN and far-IR templates and show 1) how this new technique reproduces the well-established scaling relations and successfully extracts robust quantities, while at the same time being an order of magnitude faster than other available codes and 2) how these results coupled with our recent ALMA [CI] observations of distant galaxies, that allow for an alternative Mgas estimates, take us a step further into the proper characterisation of the star formation mode of the galaxies across cosmic time.