AGW and food crops

For scientific papers on AGW, record happenings in the Arctic and the Greenland, Himalayan and Antarctic icesheets. Also weatherstorms and higher than average rainfalls and other extreme weather events.

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HBS Guy
Tractors to Australia
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AGW and food crops

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Elevated atmospheric CO2 concentrations and climate change will affect our food's quality and quantity
Kristie L Ebi
Irakli Loladze


Greenhouse gas emissions are affecting the quantity and quality of our food in two ways. First, they are driving anthropogenic climate change, which decreases yields of major cereal crops in some regions. Increased temperatures, changes in precipitation patterns, increased ozone concentrations, and more frequent and extreme heatwaves, floods, and droughts can reduce crop yields, particularly in the tropics, with risks increasing with additional warming depending on the region.1 Lower crop yields increase stunting and wasting, particularly in low-income and middle-income countries.1 Second, increased concentrations of carbon dioxide (CO2)—by directly affecting plants—worsen the nutritional quality of food by decreasing protein and mineral concentrations by 5–15%, and B vitamins by up to a 30%.2, 3, 4 Higher CO2 concentrations increase photosynthesis in C3 plants (eg, wheat, rice, potatoes, barley), which can increase crop yields. But those increases come at the cost of lower nutritional quality as plants accumulate more carbohydrates and less minerals (eg, iron and zinc), which can negatively affect human nutrition.5 Thus, accurately quantifying the effect of increasing CO2 concentrations on human nutrition requires accounting for changes in the quantity and quality of crop harvests and diets and economic parameters (eg, food prices).
https://www.thelancet.com/journals/lanp ... 1/fulltext

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HBS Guy
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