Climate change is already negatively impacting crop production and slowing productivity growth in Africa  . Climate change has reduced total agricultural productivity growth in Africa by 34% since 1961, more than in any other region . Maize yields have decreased 5.8% and wheat yields 2.3%, on average, in sub-Saharan Africa due to climate change in the period 1974-2008 . Overall, climate change has decreased total food calories across all crops in sub-Saharan Africa by 1.4% on average compared to a no climate change counterfactual since 1970, with up to 10% reductions in Ghana and Zimbabwe .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report