Increased temperatures and CO2 concentrations may increase herbaceous growth and favour legumes over grasses in mixed pastures . These effects may be modified by changes in rainfall patterns, plant competition, perennial growth habits and plant-animal interactions. The cumulative effect of these factors is uncertain. Large, persistent declines in forage quality are projected, irrespective of warming, under elevated CO2 conditions  in North American grasslands . Rising CO2 concentrations may result in losses of iron, zinc and protein in plants by up to 8% by 2050 . Little information is available on possible impacts on carbon-based micronutrients, such as vitamins. About 57% of grasses globally are C3 plants and thus susceptible to CO2 effects on their nutritional quality . These impacts will result in greater nutritional
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report