A summary of five major changes affecting the oceans and the life they support (EcoWatch). All of these have been operating for decades and continuously growing. They are all difficult to curtail, and the need for total curtailment in every case is inescapable.
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–Bits of plastic are now found everywhere, including live human bodies:
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The World Health Organization sees clear evidence of a link between climate change and global deterioration of human health and welfare (Ecologist). “With climate change comes rising food and water insecurity, higher food prices, loss of income and livelihood opportunities, negative health effects, and population displacement, threatening to undo the global progress in sustainable development that has been made in the last decades…..climate change further widens the global inequality gap that persist today…..The health benefits far outweigh the costs of meeting climate change goals.”
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Wildfire smoke is emerging as one of the greatest hazards to human health (Outside). This story argues that the suppression of natural wildfires over the last century makes the problem worse than it should be, and now there is not much we can do about it. The effects of increasing temperature and dryness from climate change are basically accelerating the inevitable final outcome.
–Minnesota is one of the places feeling the effects of far-off wildfires (MPR news):
https://www.mprnews.org/story/2019/06/05/climate-change-is-making-minnesotas-skies-smoky-this-summer
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Climate science: How dust blown off the barren land left by receding glaciers adds significantly to global warming (GlacierHub). “Glaciated clouds – those containing ice particles rather than liquid droplets – are unable to reflect as much light as clouds with liquid water. The dust from receding glaciers, the researchers found, is especially adept at glaciating clouds. In other words, clouds formed by glacier dust allow greater amounts of heat to enter Earth’s atmosphere.” This sequential process was a major factor during the warmup phase of the ancient ice ages, and now the same effect is again coming into play.
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The importance of phytoplankton in regulating the temperature of ocean surface water can now be observed (Massive Science). Phytoplankton, in the oceans convert solar energy into organic matter through the process of photosynthesis just like plants do on land. That helps to cool the water, but when water is unusually warm phytoplankton populations decline and their cooling effect is reduced. Scientists have found a clever way to observe this happening and are working to build the method into their models. “And when CDOM was factored into a sea surface temperature model, it increased the amplitude of extreme temperatures, meaning the hottest months become even hotter and the coldest months even colder. These changes resembled observed trends in recent summers and winters.” (I believe the amplification of seasonal warming by greenhouse gas warming poses an extra level of threat from this phenomenon.)
Carl