Duurzaamheidsgrenzen

Duurzaamheidsgrenzen, or planetary boundaries, represent a framework that identifies and quantifies critical Earth system processes. These boundaries define a safe operating space for humanity, beyond which the risk of abrupt and irreversible environmental change increases significantly. The concept was first introduced in 2009 by a group of international scientists, led by Johan Rockström.

There are nine identified boundaries: climate change, novel entities (like chemical pollution), stratospheric ozone depletion, atmospheric aerosol loading, ocean acidification, biogeochemical flows (nitrogen and phosphorus cycles), freshwater use, land-system change, and biosphere integrity (functional and genetic diversity). For each boundary, a pre-industrial baseline and a proposed safe operating level have been established.

Current scientific assessments indicate that several of these boundaries have already been crossed, including climate change, biosphere integrity, and biogeochemical flows. Crossing these boundaries does not mean immediate catastrophe, but rather an increased likelihood of triggering tipping points in Earth's systems, leading to potentially severe consequences for human societies and ecosystems. The framework serves as a guide for policy-making and sustainable development efforts, aiming to keep human activities within these limits to ensure a stable and resilient planet.