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James R. Martin's avatar

This may be of interest:

Excepted from https://theproudholobionts.substack.com/p/are-the-worlds-forest-dying-bad-news

"As typical of complex systems, it is not clear what causes what, but a series of changes are occurring. Because of the higher temperatures, or perhaps because of the higher CO2 concentration (or both at the same time), plants are keeping their stomata close longer. More than they did before the start of the VPD increase. Hence, they evapotranspirate less -- I think what's happening is a negative loop. It was already predicted in 1977 by Rawson et al. (cited in the paper).

A smaller VPD means less evapotranspiration, and less evapotranspiration means less rain, also in terms of the water transported inland by the biotic pump. The land is becoming drier, with rainfall concentrated in short bursts. The consequence is the current "global browning" that's replacing the earlier "global greening." It is not a small thing: forests risk disappearing. The whole ecosystem is at risk. In the meantime, those silly naked monkeys find nothing better to do than kill each other in large numbers. What to say?"

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James R. Martin's avatar

I'm sure you must be aware of this, Rob Lewis, but my research today has brought it to my attention.

"Alexander von Humboldt visited the lake [Lake Venencia, Venezuela] in 1800. He documented the negative impact of the surrounding population's land cultivation on the ecosystem. Deforestation and water diversion for irrigation led to the desiccation of Lake Valencia by dramatically reducing water levels. Lake Valencia is where Humboldt developed his conception of anthropogenic climate change.[2] He later wrote:

When forests are destroyed, as they are everywhere in America by the European planters, with an imprudent precipitation, the springs are entirely dried up, or become less abundant, The beds of the rivers remaining dry during a part of the year, are converted into torrents, whenever great rains fall on the heights. The sward and moss disappearing from the brush-wood on the sides of the mountains, the waters falling in rain are no longer impeded in their course: and instead of slowly augmenting the level of the rivers by progressive filtrations, they furrow during heavy showers the sides of the hills, bear down the loose soil, and form those sudden inundations that devastate the country.[3]"

From Wikipedia, Lake Valencia (Venezuela) https://en.wikipedia.org/wiki/Lake_Valencia_(Venezuela)

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