<Dl> <Dd> I = P ∙ A ∙ T </Dd> </Dl> <Dd> I = P ∙ A ∙ T </Dd> <Dl> <Dd> I is the impact on the environment resulting from consumption </Dd> <Dd> P is the population number </Dd> <Dd> A is the consumption per capita (affluence) </Dd> <Dd> T is the technology factor </Dd> </Dl> <Dd> I is the impact on the environment resulting from consumption </Dd>

When does a population reach the carrying capacity of the environment