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Climate Change
- Thread starter Michael Scally MD
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Global emissions of carbon dioxide have reached the highest levels on record, scientists projected Wednesday, in the latest evidence of the chasm between international goals for combating climate change and what countries are actually doing.
Between 2014 and 2016, emissions remained largely flat, leading to hopes that the world was beginning to turn a corner. Those hopes have been dashed. In 2017, global emissions grew 1.6 percent. The rise in 2018 is projected to be 2.7 percent.
Penn JL, Deutsch C, Payne JL, Sperling EA. Temperature-dependent hypoxia explains biogeography and severity of end-Permian marine mass extinction. Science 2018;362:eaat1327. Temperature-dependent hypoxia explains biogeography and severity of end-Permian marine mass extinction
Drivers of the “Great Dying”
Though our current extinction crisis is substantial, it pales in comparison to the largest extinction in Earth's history, which occurred at the end of the Permian Period. Referred to as the “Great Dying,” this event saw the loss of up to 96% of all marine species and 70% of terrestrial species. Penn et al. explored the extinction dynamics of the time using Earth system models in conjunction with physiological data across animal taxa (see the Perspective by Kump). They conclude that increased marine temperatures and reduced oxygen availability were responsible for a majority of the recorded extinctions. Because similar environmental alterations are predicted outcomes of current climate change, we would be wise to take note.
The safe and just space framework devised by Raworth calls for the world’s nations to achieve key minimum thresholds in social welfare while remaining within planetary boundaries. Using data on social and biophysical indicators provided by O’Neill et al., this paper argues that it is theoretically possible to achieve a good life for all within planetary boundaries in poor nations by building on existing exemplary models and by adopting fairer distributive policies. However, the additional biophysical pressure that this entails at a global level requires that rich nations dramatically reduce their biophysical footprints by 40–50%. Extant empirical studies suggest that this degree of reduction is unlikely to be achieved solely through efforts to decouple GDP growth from environmental impact, even under highly optimistic conditions. Therefore, for rich nations to fit within the boundaries of the safe and just space will require that they abandon growth as a policy objective and shift to post-capitalist economic models.
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