In an experiment, higher temperatures and increasing levels of carbon dioxide in the atmosphere led to lower nutritional value for crops, especially for leafy greens like spinach, kale, and arugula. Different crops responded in different ways, with variances of particular nutrients. Higher carbon emission levels led to higher sugar levels in crops, yet lower levels of essential nutrients.
https://givingcompass.org/article/climate-change-worsens-crops-nutritional-value-research-indicates