Earlier civilizations have perished because of climate change (Scientific American). This article by Kate Marvel uses the city of Cahokia as an illustration, right in the middle of America and only a few centuries back in time, together with contemporary changes of a different kind in the Old World. These happened quite naturally, without human influence being a factor. She makes a good point.
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New research provides a startling link between the impending loss of Arctic sea ice and global warming (KPBS). The additional solar energy from complete loss of ice reflectivity over future full summer seasons, with constant cloudiness, would equal the greenhouse-based energy added by one trillion tons of human CO2 emissions. From the Abstract: “These results suggest that the additional heating due to complete Arctic sea ice loss would hasten global warming by an estimated 25 years.” (Or about 0.5C by my calculation.) (The podcast is only one minute long.)
–Link to the Abstract: http://scrippsscholars.ucsd.edu/ieisenman/content/radiative-heating-ice-free-arctic-ocean
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The extraordinary potential for adding carbon emissions from burning peatlands (Wired). Currently the focus is on the Arctic wildfires, but the same thing is happening more often in many parts of the world. “When peat burns, it emits lots of CO2, and when peatlands aren’t healthy, they don’t capture any…..the problem is supremely urgent: Peatlands cover 1.3 million square miles around the world, storing the same amount of carbon you’d get from burning fossil fuels for 60 years.”
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China is making unexpected progress toward lowering its emissions peak (Carbon Brief). “China is by far the world’s biggest polluter, responsible for more emissions than the US and EU combined…..a team of researchers has shown that as China’s burgeoning cities become wealthier, their per capita emissions begin to drop…..this trend could in turn trigger an overall dip in CO2 levels across the nation, and mean that despite the current target for emissions peaking by 2030, they may in fact level out at some point between 2021 and 2025.”
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Now something simply has to be done about Brazil, a nation that poses a greater threat to the entire globe than any other. That is the view expressed by The New Republic, based on the destruction of the Amazon forests and backed up by many scientists. “The Amazon is the largest forested area in the world, one of the most biodiverse places on earth, and an enormous carbon sink for the atmosphere. Deforestation for agricultural purposes has been a concern for the last half-century, as an area the size of Texas has been slashed and burned. But what many policymakers may not be aware of is that if another fifth of the Amazon were to be destroyed for farmland or development, it could trigger something called a “dieback” where the forest would collapse in on itself, creating a carbon bomb released in the atmosphere. It would release the equivalent of 140 years of human activity. (Open those last two links to see why.)
Carl