Learner1
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This looks like an interesting new look at an old problem. Not only are foods less nutritious due to soil depletion, etc. than they were 50-70 years ago, But it looks like CO2 is having a little known but important impact - a shift to higher carbohydrate content in foods, and less protein and other nutrients...
http://www.politico.com/agenda/story/2017/09/13/food-nutrients-carbon-dioxide-000511
http://www.politico.com/agenda/story/2017/09/13/food-nutrients-carbon-dioxide-000511
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