pptcr: Persistent Pollution Technology Change Rate
Variable
Persistent pollution sector
Persistent Pollution Technology Change Rate [1/year]
pptcr = clip (0, ppt * pptcm , pyear , time)

pptcr in the updating graph: ( how to read )
In nodes
pptcm : persistent pollution technology change multiplier
pyear : POLICY YEAR
ppt : Persistent Pollution Technology
Out nodes
ppt : Persistent Pollution Technology