The Planetary Accounting Framework: a novel, quota-based approach to understanding the impacts of any scale of human activity in the context of the Planetary Boundaries

Table 2 Driver-Pressure-State-Impact-Response (DPSIR) classification of the Planetary Boundary control variables

Earth system process	Planetary Boundary Control variable	DPSIR Category
Climate change	Atmospheric concentration of CO₂	State
Climate change	Change in radiative forcing	State
Biodiversity loss	Extinction rate	Impact
Nitrogen and phosphorus cycle	N₂ removed from the atmosphere	Pressure
Nitrogen and phosphorus cycle	P flowing into oceans	Pressure
Stratospheric ozone depletion	Atmospheric concentration of ozone	State
Ocean acidification	Mean saturation state of aragonite in the oceans	State
Fresh water use	Freshwater consumption	Pressure
Change in land-use	Percentage of land cover converted to cropland	State
Novel entities	NA	NA
Atmospheric aerosol loading	Aerosol optical depth	State