Are "planetary boundaries" global thresholds?(Please select one answer)
A. Yes
B. No
C. Only 3 out of the 9 boundaries are thresholds
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Which three of the nine planetary boundaries had already been transgressed in the original publication of planetary boundaries?(Please choose all that apply)
A. Climate change
B. Ocean acidification
C. Stratospheric ozone depletion
D. Nitrogen and phosphorus cycles
E. Freshwater use
F. Land use
G. Biodiversity loss
H. Aerosol loading
I. Chemical pollution
Which two of the nine planetary boundaries have not been quantified yet?(Please select one answer)
A. Freshwater use and land use
B. Aerosol loading and chemical pollution
C. Ozone depletion and biodiversity loss
How have the boundary values of the nine planetary boundaries been determined?(Please select one answer)
A. Using data on historical trends for each process
B. Applying current knowledge of Earth system processes and development trajectories
C. Using global models for assessments of potential futures
D. All of the above
As part of the scientific basis for the planetary boundaries framework, what dynamic behaviour is assumed to characterise Earth system processes?(Please select one answer)
All processes are assumed to follow linear relationships when influential parameters are changed
B. All processes are assumed to remain unaffected when influential parameters are changed
C. All processes are assumed to have thresholds or "tipping points"
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