  The Planetary Boundary for Climate Change has been surpassed, and humanity
must therefore decide on a pathway back to the safe operating space below the
Planetary boundaries to minimise the risk of deleterious or even catastrophic
environmental change at continental to global scales. However, the control
variables used in the concept do not link to current indicators quantified in
life-cycle assessments. Translating the Planetary Boundaries into maximum
scores for life-cycle assessment indicators is therefore necessary to enable
the assessment of whether life-cycle environmental impacts of e.g. products and
services respect the Planetary Boundaries. This paper investigates two
different approaches for translating the Planetary Boundary for Climate Change
into estimations of maximum emission of greenhouse gasses expressed as annual
emissions of CO2-equivalents, a commonly used Climate Change indicator in
life-cycle assessments. The estimations may serve as an end goal benchmark for
the life-cycle environmental impact of products and services in proposed
pathways and roadmaps for the regeneration back to the Planetary Boundary for
Climate Change.
