A new calculation of significant increase in natural methane emissions due to warmer temperatures has been reported (University of Eastern Finland). “Lakes account for about 10% of the boreal landscape and are, globally, responsible for approximately 30% of biogenic methane emissions that have been found to increase under changing climate conditions.” Scientists are now able to measure the rate of increase and can explain a full set of reasons for why the rate is growing. “The authors estimated that the total current diffusive emission from Finnish lakes is 0.12±0.03 Tg CH4 yr-1 and will increase by 26-59% by the end of this century, depending on the warming scenario used. The study showed that while the warming of lake water and sediments plays a vital role, the increase in the length of the ice-free period is a key factor increasing methane emissions in the future.”
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—Extra Comment: Historic data taken from ice cores indicate that atmospheric methane content regularly tends to rise or fall in a pattern much like that of CO2 when global temperatures are rising or falling, but by even greater percentages. Historically the reasons are all natural, such as in the above example showing one small possible reason. In today’s world the relationship is similar because both gases reflect large contributions from human activity, exacerbated by natural changes. One more thing, as I’ve said before: I believe that if methane and CO2 concentrations are both doubled, no matter from what levels, the methane would have about half as much greenhouse warming power as the CO2 before any kind of feedback effect is considered, such as those produced by water vapor or cloud changes, etc. Thus, whenever methane is having a greater rate of increase in concentration than CO2 the net difference in heating power should be more narrow. (I will expand on this idea at some later date.)
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Scientists have found evidence that deep water circulation in the North Atlantic has greater instability than currently assumed during times when temperatures are rising (AAAS). The findings were taken from high-resolution sediments recovered off the southern tip of Greenland, showing 500,000 years of history. “While current climate assessments recognize the severe impact that disruption of North Atlantic Deep Water (NADW) ventilation would have on global climate, disruption to this ocean phenomenon is generally considered to be a low probability tipping point. Now, results from this study suggest a need to reevaluate the long-held notion of warm-climate NADW stability and to consider rapid changes as a possible – if not intrinsic – feature of variability during warm climates. Atlantic meridional overturning circulation (AMOC) and NADW ventilation play a crucial role in mediating the distribution and storage of atmospheric carbon dioxide and heat, as well as in mediating Atlantic-spanning climate patterns.” Such changes could be large, abrupt and frequent under the new assumptions that are recommended.
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A new study describes pervasive shifts in abundance of marine life as species migrate in search of cooler waters (Cosmos magazine). “Populations of plants and sea creatures in cooler waters have grown as previously unliveable habitats become more viable, while those near warmer waters have dropped off…..Meanwhile, some marine life suffers as it is not able to adapt fast enough to survive warming, and this is most noticeable in populations nearer the equator…..This is likely to continue, impacting further on local marine assemblages and the coastal industries that depend on them.” Practically all large ecosystems are harmfully disturbed by this kind of activity.
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Why wealthy people consume so much energy (Vox). Researchers have taken a close look at behavior patterns all over the world, and come up with a number of interesting conclusions. “So, what did it find? In a nutshell, as people get wealthier, they spend more on transport (cars, boats, planes, vacations), which is one of the most energy intensive consumer categories. Because wealthier people turn to more energy intensive goods, the energy gap rises even faster than the income gap. This suggests important policy lessons, including some on how the US ought to respond to Covid-19.”
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Advanced research in solar cell technology shows promising results (NREL). “Researchers at the National Renewable Energy Laboratory, working in collaboration with their counterparts in the Republic of Korea, have validated the potential of using a combination of perovskite and silicon to create solar cells that are more than 30% efficient…..The scientists also noted accelerated testing showed the perovskite cell exhibited “excellent long-term stability” by retaining more than 80 percent of its initial efficiency after 1,000 hours of continuous illumination.” Sooner or later something of this type should come to fruition in one lab or another, bringing great benefits to society.
Carl