Topic archive
Core framework outlining safe operating limits for Earth’s systems.
The planetary boundaries framework identifies nine Earth-system processes and proposes quantitative limits to maintain a safe operating space for humanity. While influential in science…
The planetary boundaries framework defines a safe operating space for humanity, but not all boundaries are global in scale. Some, like climate change and…
Chemical pollution is difficult to measure because of the vast number of chemicals in use, their complex environmental behavior, and limitations in analytical technology.…
Climate mitigation and climate adaptation are two complementary strategies for addressing climate change. Mitigation focuses on reducing greenhouse gas emissions to slow global warming,…
The Planetary Boundaries framework defines a safe operating space for nine Earth-system processes, while the Ecological Footprint measures human demand on nature against Earth's…
The planetary boundaries framework identifies nine Earth-system processes that regulate the stability and resilience of the planet. These boundaries are not independent; they interact…
As of the 2023 update by Richardson et al., six of the nine planetary boundaries have been transgressed: climate change, biosphere integrity (both genetic…
As of 2023, global CO₂ emissions from fossil fuels and industry reached approximately 36.8 billion tonnes (GtCO₂), while total greenhouse gas emissions expressed in…
Planetary boundaries are measured using control variables—specific, quantifiable indicators of Earth-system processes—compared against proposed safe limits derived from the Holocene baseline. As of 2023,…
In 2023, global absolute CO2 emissions reached 36.8 billion tonnes, while per-capita emissions averaged 4.6 tonnes per person, according to the Global Carbon Project.…
