There is a new study about the effect of melting ice on global climate, and it is getting much attention. This is a subject that James Hansen’s group treated in a more dramatic and quite controversial way in 2015, known as “Ice melt, sea level rise and superstorms, (etc),” which can easily be accessed and read in full with a search. The new treatment is more limited, being applied only to Antarctic melting, and considerably tamed down, but is still controversial. Rather oddly, it carries a list of 87 reference works, none of which have any mention of work from Hansen. This review of the new study by Zeke Hausfather at Carbon Brief provides first rate coverage. Climate activists do not like this kind of study because of the strong cooling effect it produces, temporarily of course, without any need for help from humans such as cutting back on their carbon emissions. The effect can be expected whenever vast amounts of ice break off from unstable glaciers, tumble into the oceans and start melting. That kind of action, using the rapid release of cooling power that has been stored up in the ice sheets for perhaps millions of years, is sure to cool the surface of the oceans where it is collected, maybe a lot, for an extended period of time. As noted in the study (and even more so by Hansen) other kinds of weather changes of an unexpected type also get involved.
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Glacial ice from mountains in western China is melting at an accelerated rate, and fast. From Greenpeace, “In just the last few months, thousands of people have been evacuated from their homes due to threats of flooding.” There are also concerns about the eventual disappearance of these glaciers, which supply water to 1.8 billion people, due to rapidly rising air temperatures.
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A comprehensive new study assesses the way climate hazards are accumulating as they happen more frequently. “An analysis of thousands of peer-reviewed scientific papers reveals 467 ways in which human health, food, water, economy, infrastructure, and security have been impacted by multiple climatic changes including: warming, drought, heatwaves, wildfires, precipitation, floods, storms, sea level rise and changes in land cover and ocean chemistry…..This research reveals that society faces a much larger threat from climate change than previous studies have suggested.” From the lead author, “The collision of cumulative climate hazards is not something on the horizon, it is already here.” From a co-author, “The evidence of climate change impacting humanity is abundant, loud and clear….the outstanding question is—how many wake-up calls will it take to wake up?”
https://phys.org/news/2018-11-greenhouse-gasses-triggering.html
https://phys.org/news/2018-11-greenhouse-gasses-triggering.html
–Tim Radford also has a good review of this important paper:
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Climate change and loss of biodiversity are closely intertwined, but only one gets all the attention (The Guardian). A UN conference dealing with the latter is now in session, with almost no media coverage, while a number of nations are not even attending. Previous agreements have been ineffectual, and current statistics are indeed grim. “We haven’t succeeded in getting across how important biodiversity is. It’s not just about a few endangered species. It is absolutely clear that what is happening to our ecosystems has an impact on humanity.”
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A report from MIT explains the stunning 99% decline in the cost of solar power over the last four decades. The role of government assistance gets well-deserved credit. The report could have said more about comparisons between the assistance given to solar power and that dedicated to advancing nuclear fusion, which I suspect has heavily favored the latter, with a complete contrast in outcome. Of extra interest concerning the future of solar technology, “While the study focused on past performance, the factors it identified suggest that ‘it does look like there are opportunities for further cost improvements with this technology.'”
Carl