Climate Letter #1242

Posted on August 23, 2018 by Carl Campbell
Trees are growing faster and getting bigger but the wood is less dense and not as strong.  Growth spurts are real, because of the longer growing season and extra fertilization from rapidly increasing CO2, but the amount of CO2 being soaked up may have been overestimated.

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Another study shows that the total amount of plant growth in Arctic regions due to warming temperatures may have been underestimated (Yale e360).  A new study uses satellite data to confirm what others have suspected should happen when temperatures are rapidly rising and there is less freezing of soils.  “By the year 2100, Keenan and his colleagues estimate that only 20 percent of vegetated land in the northern hemisphere will still be limited by cold conditions.”  (Similar forecasts have been used by researchers who need to estimate the future trend of carbon emissions due to the meltdown of permafrost.  There is a kind of rough balance, not necessarily even, between carbon release from below and carbon uptake above.)   https://e360.yale.edu/digest/areas-where-cold-temperatures-limit-plant-growth-are-shrinking

Oil companies in Texas are worried about effects of climate change, and are seeking help for protection.  Help could come in the form of a proposed 60-mile seawall along the Gulf Coast, part of a $61 billion project designed to prevent storm surges from coming ashore and ruining many of their refineries along with all sorts of other valuable properties.  There is ongoing discussion about who should pay for such a wall.
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What effect do wildfires have on the trend of climate change (Inside Climate News)?  This is a very complicated subject, and the story covers all the different aspects of warming and cooling effects quite well.  When all is said and done, “Scientists can’t say for certain whether the global level of fire activity in recent years is warming or cooling the atmosphere overall.”  They do know that a majority of the effects are unhealthy for the planet in one way or another and thus undesirable.
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A new theory about a mysterious change in past ice sheet cycles.  About one million years ago the cycles shifted from 40,000 year intervals to the more familiar 100,000 year intervals of the last eight cycles, an occurrence which no one has been able to understand.  Researchers have now found clues to a plausible reason, which is historically interesting but nothing we need to worry about today.

Carl

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