Since AR5, there are more examples of observed impacts from past climate change in cropping systems , pastoral systems , forests , fisheries  and mixed farming systems . These assessments of observed impacts make use of historical data on climate, production area and yield to attribute the role of climate in driving changes in suitability, production, yield, food quality or total factor productivity . Observations across the global food systems have been analysed , with the advantage that unexpected impacts due to changes in seasonality and biotic interactions can be detected. Quantitative analysis is only possible in places with adequate historical data; in many cases, studies rely on qualitative assessments, often drawing on farmers' perceptions of climate impacts.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report