Presented by the Stockholm Resilience Centre, the Planetary Boundaries are limits set for 9 environmental categories within which humanity can continue to safely thrive for generations to come. Crossing the boundaries implies severe consequences for humanity and the environment. The categorized 9 planetary boundaries are climate change (already crossed), change in biosphere integrity (biodiversity loss and species extinction, already crossed), stratospheric ozone depletion, ocean acidification, biogeochemical flows (phosphorus and nitrogen cycles, already crossed), land-system change (already crossed), freshwater use, atmospheric aerosol loading (microscopic particles in the atmosphere that affect climate and living organisms), and the introduction of novel entities.
