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Broken age guide update#
Broken age guide driver#

Ocean acidification is close to being breached, while aerosol loading regionally exceeds the boundary.

Broken age guide update#

“This planetary boundaries framework update finds that six of the nine boundaries are transgressed, suggesting that Earth is now well outside of the safe operating space for humanity. Here is a portion of the abstract of the report: What follows is a condensed version that will necessarily leave out certain important details that provide context to the findings. You, gentle reader, are encouraged - make that urged - to read the report yourself. There report is extensive and was published in the journal Science Advances. The climate scientists concluded that 6 of the boundaries have been breached, suggesting the onset of a period of major instability for humanity.

atmospheric aerosol loading - no standard currently in place.Ĭredit: “Azote for Stockholm Resilience Centre, based on analysis in Richardson et al 2023.” Climate Scientists Weigh InĪ recent study led by professor Katherine Richardson of the University of Copenhagen examined those nine planetary boundaries and reviewed over 2000 climate studies.

chemical pollution - introduction of novel entities in the environment.

the erosion of biosphere integrity - an annual rate of loss of biological diversity of < 10 extinctions per million species.

land system change - < 15% of the ice-free land surface under cropland.

global freshwater use - < 4000 km3/yr of consumptive use of runoff resources.

biogeochemical flows in the nitrogen cycle - limit industrial and agricultural fixation of N2 and phosphorus.

stratospheric ozone depletion - less than 5% reduction in total atmospheric O3 from a pre-industrial level of 290 Dobson Units.

ocean acidification - mean surface seawater saturation state with respect to aragonite ≥ 80% of pre-industrial levels.

climate change - CO2 concentration in the atmosphere < 350 ppm and/or a maximum change of +1 W/m2 in radiative forcing.

Nine Planetary BoundariesĪccording to Wikipedia, the nine planetary boundaries as defined by Rockstrom and his colleagues are: According to the framework, “transgressing one or more planetary boundaries may be deleterious or even catastrophic due to the risk of crossing thresholds that will trigger non-linear, abrupt environmental change within continental-scale to planetary-scale systems.” To the extent these Earth system boundaries have not been crossed, they mark the “safe zone” for human societies on the planet.

Broken age guide driver#

The framework is based on scientific evidence that human actions, especially those of industrialized societies since the Industrial Revolution, have become the main driver of global environmental change. This would mean the Earth system would leave the period of stability of the Holocene, in which human society developed.Ĭrossing a planetary boundary comes at the risk of abrupt environmental change. Beyond these limits, the environment may not be able to self-regulate anymore.

Planetary boundaries are a framework to describe limits to the impacts of human activities on the Earth system.

In 2009, Johan Rockström, the head of the Stockholm Resilience Center, and a group of 28 internationally renowned created the planetary boundaries concept - a set of nine planetary boundaries within which humanity can continue to develop and thrive for generations to come.