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Given that HN has had articles on the decline of the insect population (https://en.wikipedia.org/wiki/Decline_in_insect_populations) and the decline in bird populations (https://www.nytimes.com/2019/09/19/science/bird-populations-...), I am surprised that food supply is not listed as one of the causes of body changed.

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here you go https://www.scientificamerican.com/article/does-global-warmi...

Macronutrients shift by minor amounts (single digit percentages), but there is more overall food. CO2 causes a more efficient use of water in photosynthesis and improves overall crop yields. The last time CO2 was in the thousands of PPM, the ancestors of birds...AKA dinosaurs...thrived and grew to enormous sizes.

But I don't think dinosaurs were plagued by microplastics and poisons industrially designed to kill them instead of their food supply.

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