BPH is Green - Gas & CCS, page-208

We might have to change the title of this thread to " BPH is BLUE - Gas & CCS".

https://www.naturalgasworld.com/opportunities-and-challenges-for-hydrogen-in-a-decarbonized-energy-system-88960

Extract 1
A colourful array of terms has emerged to describe the technology options, based on which form of primary energy they are derived from—black for coal, grey for gas, blue for gas with carbon capture and storage (CCS), green for renewable electricity via electrolysis, turquoise for gas via less-proven pyrolysis technology, and more.

Extract 2
From these scenarios we can conclude that both blue and green hydrogen could be important in the coming decades, and it is not a simple case of ‘green versus blue’. In fact, the dominant form of production may well vary between locations according to natural endowments, proximity to demand, proximity to viable CO2 geo-sequestration sites, and other factors such as policy and regulation.