He has worked primarily on documenting the impact of climate change and rising carbon dioxide levels on: Crop selection for CO2 responsiveness to improve production; Climate and agronomic pests, including chemical management; Climate, plant biology and public health impacts on food security with a focus on nutrition and pesticide use. Dr. Ziska is a contributor to the 2007, 2014 and 2022 International Panel on Climate Change (IPCC) report (Food Security Chapter(link is external and opens in a new window)). He is also a contributor to the 2014 and 2018 National Climate Assessment (NCA) (Public Health Chapter and Air quality chapter respectively); and, The Impacts of Climate Change on Human Health in the United States: A Scientific Assessment.