Definitely worth mentioning, as well as the evidence that high CO2 levels tend to promote weed growth and decrease effectiveness of agricultural herbicides [1] and promotes growth of lower-quality versions of food crops [2]. Even in my gardens I have a lot more greenery, and it's mostly low-quality foliage. We don't have increased food production.
[1] http://allenpress.com/publications/pr/WEES59_1 [2] https://www.sciencenews.org/blog/science-public/rising-co2-p...