The Danish Ministry of Finance has published guidelines for socio-economic evaluation (link to the text in Danish can be found here: https://fm.dk/udgivelser/2017/august/vejledning-i-samfundsoekonomiske-konsekvensvurderinger/)  The guidance includes a focus on environmental effects. Specifically, it states that whenever new policy initiatives are expected to have an effect on the climate, the impact on CO2-emissions of the concrete policy initiative must be assessed (and where possible shadow prices are calculated). Guidance from the Ministry of Finance is supplemented by more detailed, technical guidance on estimating environmental impacts (link to the text in Danish can be found here: https://kefm.dk/Media/4/0/Vejledning om vurdering af konsekvenser for klima milj%C3%B8 og natur (2).pdf)