Uncertainties persist regarding estimates of net primary productivity  in grazing lands , so estimation of climate change impacts on grasslands is challenging. Mean global annual NPP is projected to decline 10 gC m-2 yr-1 in 2050 under RCP8.5, although herbaceous NPP is projected to increase slightly . Similar estimates were made by Havlik et al. : large increases in projected NPP in higher northern latitudes 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report