{"id":134679,"date":"2023-09-14T15:39:14","date_gmt":"2023-09-14T15:39:14","guid":{"rendered":"https:\/\/finbestnews.com\/?p=134679"},"modified":"2023-09-14T15:39:14","modified_gmt":"2023-09-14T15:39:14","slug":"earth-is-breaking-through-the-boundaries-that-make-it-habitable","status":"publish","type":"post","link":"https:\/\/finbestnews.com\/business\/earth-is-breaking-through-the-boundaries-that-make-it-habitable\/","title":{"rendered":"Earth Is Breaking Through The Boundaries That Make It Habitable"},"content":{"rendered":"

At the end of the last Ice Age, about 10,000 years ago, Earth developed systems that supported the environment and life-support systems, including the stability and warmth that the planet and its inhabitants have enjoyed for those millennia. That could be about to change.<\/p>\n

An international team of scientists on Wednesday published an updated report in Science Advances on what is known as the planetary boundaries framework, the limits on nine processes that are \u201ccritical for maintaining the stability and resilience of Earth system as a whole.\u201d At present, all nine are \u201cheavily perturbed by human activities.\u201d<\/p>\n

The following illustration from the report shows the position of each of the nine framework processes in relation to the \u201csafe operating space\u201d depicted as the green-shaded Earth. Of the nine processes, six have exceeded their safe system limits: novel entities; climate change; biosphere integrity; land-system change; freshwater change; and biogeochemical flows. The other three (ocean acidification, atmospheric aerosol loading, and stratospheric ozone depletion) remain within safe limits, although ocean acidification is close to breaking through.<\/p>\n

Note that boundary positions do not indicate or predict threshold shifts in Earth\u2019s system state:<\/p>\n

\n

They are placed at a level where the available evidence suggests that further perturbation of the individual process could potentially lead to systemic planetary change by altering and fundamentally reshaping the dynamics and spatiotemporal patterns of geosphere-biosphere interactions and their feedbacks.<\/p>\n<\/blockquote>\n

Source: Azote for Stockholm Resilience Centre, based on analysis in Richardson et al 2023<\/span><\/p>\n

A co-author of the study, Johan Rockstr\u00f6m, professor in environmental science at Stockholm Resilience Centre, commented: \u201cWe don\u2019t know how long we can keep transgressing these key boundaries before combined pressures lead to irreversible change and harm.\u201d In other words, we know these transgressions are the result of human activity but we do not know the point at which that activity will have passed the tipping point.<\/p>\n

The study identifies climate change and biosphere integrity as core boundaries in the overall framework. Biosphere integrity has two parts: genetic diversity inherited through natural selection and functional integrity. Genetic diversity is measured by a boundary level of less than 10 species extinctions per million species-years and functional integrity is the \u201chuman appropriation of the biosphere\u2019s net primary production expressed as a fraction of its net primary production since the last Ice Age, also known as the Holocene.\u201d<\/p>\n

Among the measurable climate change variables, \u201cthe most important anthropogenic [human-caused] impacts on Earth\u2019s energy budgets are the emission of greenhouse gases and aerosols and surface albedo [the amount of light and heat reflected from Earth\u2019s surface] changes. The less light and heat reflected back into space, the higher the albedo.\u201d<\/p>\n

The most well-known of the climate change metrics is the 1.5\u00b0C target for global warming by 2100 set by the Paris Agreement. That target infers an atmospheric carbon dioxide concentration of 350 parts per million, well below the current concentration of 447 parts per million.<\/p>\n

According to a simulation run by the study\u2019s authors, had the Earth remained at its 1988 operating state, \u201ctemperature over the global land surface would not have increased by more than an additional 0.6\u00b0C in the subsequent 800 years (and not >1.3\u00b0C compared to the preindustrial period).\u201d In 1988, carbon dioxide levels had reached 350 parts per million, and the Earth\u2019s remaining blanket of tropical, temperate, and boreal forests 85%, 50%, and 85%, respectively, been maintained, \u201cessentially stable planetary conditions would have been maintained \u2026 within the safe operating space.\u201d<\/p>\n

Rockstr\u00f6m gets the last word:<\/p>\n

\n

Science and the world at large are really concerned over all the extreme climate events hitting societies across the planet as we move through the third human-amplified El Ni\u00f1o in only 25 years. But what worries us, even more, is the rising signs of dwindling planetary resilience, manifested by the breaching of planetary boundaries, which brings us closer to tipping points, and closes the window to having any chance of holding the 1.5\u00b0C planetary climate boundary.<\/p>\n<\/blockquote>\n

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Source: Read Full Article<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

At the end of the last Ice Age, about 10,000 years ago, Earth developed systems that supported the environment and life-support systems, including the stability and warmth that the planet and its inhabitants have enjoyed for those millennia. That could be about to change. 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