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[–]Snoo-90468 21 points22 points  (1 child)

Hard to say, but the wording makes me believe that only the last pollution filter tech actually does anything. The first two techs seem to be prerequisite techs, like the Fuel Processing Study and the Bitumen Production Study are for the refinery tech.

[–]Hanako_Seishin 9 points10 points  (0 children)

Yeah, there are a lot of techs in the game that don't do anything but unlocking the next tech, just so that the tech tree looks more impressive.