Team Trump doesn't follow the science
The Trump administration has refused to publicize dozens of government-funded studies that carry warnings about the effects of climate change, defying a longstanding practice of touting such findings by the Agriculture Department’s acclaimed in-house scientists.
The studies range from a groundbreaking discovery that rice loses vitamins in a carbon-rich environment — a potentially serious health concern for the 600 million people world-wide whose diet consists mostly of rice — to a finding that climate change could exacerbate allergy seasons to a warning to farmers about the reduction in quality of grasses important for raising cattle.
Emphasis mine. I'd heard that, at least with some plants, higher CO2 isn't going to be the boon some deniers claim it will be. This appears to add some detail.