Agricultural Degradation
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Climate Change Breeds War in Africa
by Alan Singer 30/7/23 DAILY KOS
Filippo Grandi, the U.N. High Commissioner for Refugees, warns European nations that refugees from Sahel region will be moving north to escape violence, climate crises like droughts and floods, and food shortages.
Some of America's biggest vegetable growers fought for water. Then the water ran out
For decades, Westlands has led the fight against environmental rules that restrict the flow of water from California's rivers to its farmers. It sued the government, lobbied friendly politicians, and took on critics wherever it found them, even in Congress. "Where's the outrage, that government decisions have created zero water supplies for communities in the San Joaquin Valley?" Westlands General Manager Tom Birmingham admonished a congressional committee in 2016.
Uncertain harvest: Agriculture’s season of gloom
by Capital and Main 21/6/25 DAILY KOS
“Our great Farmers and people in the Hotel and Leisure business have been stating that our very aggressive policy on immigration is taking good, longtime workers away from them, with those jobs being almost impossible to replace,” Trump wrote. “This is not good. We must protect our Farmers. … Changes are coming!”
Climate crisis could hit yields of key crops even if farmers adapt, study finds
byn Ajit Niranjan 18/6/25 The Guardian
Maize, soy, rice, wheat, cassava and sorghum yields are projected to fall by as much as 120 calories per person per day for every 1C the planet heats up, according to new research in Nature, with average daily losses that could add up to the equivalent of not having breakfast.
Climate crisis could hit yields of key crops even if farmers adapt, study finds
byn Ajit Niranjan 18/6/25 The Guardian
Maize, soy, rice, wheat, cassava and sorghum yields are projected to fall by as much as 120 calories per person per day for every 1C the planet heats up, according to new research in Nature, with average daily losses that could add up to the equivalent of not having breakfast.
Do we only have 60 harvests left?
[https://ourworldindata.org/soil-lifespans?fbclid=IwAR02haa0AFBP8BOYNz6JND2Uv7qWS_MQB7-OOcORvd19jW4hZ7qDCoLsujU by Hannah Ritchie January 14, 2021 Our World in Data]
The stark claim that the world has only 100; 60 or even 30 years of harvests left often hits the headlines. Although they continue to be repeated, there is no scientific basis to them. While the claims are overblown, soil erosion is an important problem. Erosion rates from across the world span five orders of magnitude. Some are eroding quickly: 16% of soils are estimated to have a lifespan of less than 100 years. Others are eroding slowly: half have a lifespan greater than 1000 years; and one-third have over 5000 years. To protect our soils we must adopt better agricultural practices – such as cover cropping, minimal or no tillage, and contour cultivation. This way we can extend the lifespan of the soils that we all depend on.
Newly identified jet-stream pattern could imperil global food supplies, says study
<embed>https://phys.org/news/2019-12-large-atmospheric-jet-stream-global.html</embed>
The wave-5 patterns tend to hover over central North America, eastern Europe and eastern Asia; the wave-7 patterns over western-central North America, western Europe and western Asia. In both cases, the results are the same: hot air swirls up from the south into the peaks, producing abnormal spikes in temperature that can go on for weeks. This in turn reduces rainfall, dries up soils and vegetation, and kills crops in each region.
Scientists have identified systematic meanders in the globe-circling northern jet stream that have caused simultaneous crop-damaging heat waves in widely separated breadbasket regions-a previously unquantified threat to global food production that, they say, could worsen with global warming. The research shows that certain kinds of waves in the atmospheric circulation can become amplified and then lock in place for extended periods, triggering the concurrent heat waves. Affected parts of North America, Europe and Asia together produce a quarter of the world food supply. The study appears this week in the journal Nature Climate Change.
"We found a 20-fold increase in the risk of simultaneous heat waves in major crop-producing regions when these global-scale wind patterns are in place," said lead author Kai Kornhuber, a postdoctoral researcher at Columbia University's Earth Institute. "Until now, this was an underexplored vulnerability in the food system. During these events there actually is a global structure in the otherwise quite chaotic circulation. The bell can ring in multiple regions at once."
Changing risks of simultaneous global breadbasket failure
<embed>https://www.nature.com/articles/s41558-019-0600-z</embed>
The risk of extreme climatic conditions leading to unusually low global agricultural production is exacerbated if more than one global ‘breadbasket’ is exposed at the same time. Such shocks can pose a risk to the global food system, amplifying threats to food security, and could potentially trigger other systemic risks1,2. While the possibility of climatic extremes hitting more than one breadbasket has been postulated3,4, little is known about the actual risk. Here we combine region-specific data on agricultural production with spatial statistics of climatic extremes to quantify the changing risk of low production for the major food-producing regions (breadbaskets) over time. We show an increasing risk of simultaneous failure of wheat, maize and soybean crops across the breadbaskets analysed. For rice, risks of simultaneous adverse climate conditions have decreased in the recent past, mostly owing to solar radiation changes favouring rice growth. Depending on the correlation structure between the breadbaskets, spatial dependence between climatic extremes globally can mitigate or aggravate the risks for the global food production. Our analysis can provide the basis for more efficient allocation of resources to contingency plans and/or strategic crop reserves that would enhance the resilience of the global food system.
Climate change will make hundreds of millions more people nutrient deficient
<embed>https://www.theguardian.com/science/2018/aug/27/climate-change-will-make-hundreds-of-millions-more-people-nutrient-deficient</embed>
Previous research has shown that many food crops become less nutritious when grown under the CO2 levels expected by 2050, with reductions of protein, iron and zinc estimated at 3–17%.
