“No one knows what will happen to civilization if planetary conditions continue to change…”
From Jo Bish of Population Media Center About PMC
Late last week, Science Magazine published a paper titled “Planetary boundaries: Guiding human development on a changing planet.” In short, the paper is an updated version of a 2009 effort, and contends that humans have now forced transgression of four out of nine “planetary boundaries”: extinction rates; deforestation; the level of carbon dioxide in the atmosphere; and the flow of nitrogen and phosphorous (used on land as fertiliser) into the ocean.
Of course, it seems the only thing humans discard faster than banal consumer widgets are serious, scientifically-backed warnings about our highly-advanced skills of fouling our own nest. This is not altogether surprising when factions of the scientific community itself work overtime to sow doubt about limits to growth. For example, Dot Earth has given a platform to a set of authors, including the infamous Erle Ellis (Overpopulation Is Not The Problem), who gaudily assert that “The key to better environmental outcomes is not in ending human alteration of environments but in anticipating and mitigating their negative consequences.” Fortunately, Dot Earth also includes a rebuttal by the paper’s lead authors. Below is an article I found in the Sydney Morning Herald, covering the new Science report. Immediately below is the abstract.
The planetary boundaries framework defines a safe operating space for humanity based on the intrinsic biophysical processes that regulate the stability of the Earth System. Here, we revise and update the planetary boundaries framework, with a focus on the underpinning biophysical science, based on targeted input from expert research communities and on more general scientific advances over the past 5 years. Several of the boundaries now have a two-tier approach, reflecting the importance of cross-scale interactions and the regional-level heterogeneity of the processes that underpin the boundaries. Two core boundaries-climate change and biosphere integrity-have been identified, each of which has the potential on its own to drive the Earth System into a new state should they be substantially and persistently transgressed.
Link to the Science Article: