African countries such as Nigeria are anticipated to be more susceptible to the impacts of climate change due to large dependence on rainfed agriculture and to several uncertainties in the responses of crop production to climate change. The impacts of climate change on crop water requirements (CWR), irrigation water requirements (IWR), yields and crop water productivity (CWP) of rainfed maize in Ogun-Osun River Basin, Nigeria were evaluated for a baseline period (1986–2015) and future projection period (2021–2099) under Representative Concentration Pathway (RCP) 4.5 and RCP 8.5 scenarios. For the baseline period, there is no significant trend within the variables studied. However, IWR is projected to increase significantly by up to 140% in the future period, while yield might likely decline under both scenarios up to −12%. This study shows that in the future periods, supplemental irrigation has little impact in improving yields, but an increase in soil fertility can improve yields and CWP by up to 80% in 2099. This paper offers useful information on suitable adaptation measures which could be implemented by stakeholders and policymakers to counterbalance the effects of climate change on crop production.

Water, energy, and food are necessary resources for well‐being and economic development. The physical and economic access to these resources in most Sub‐Saharan countries remains very low while the outbreak of COVID‐19 is projected to worsen the situation. Therefore, this study aims to assess the impacts of COVID‐19 on the access to water, energy, and food as well as to identify innovations in water sanitation and hygiene (WASH) practices and examine the current policy interventions in Nigeria, Uganda, and Tanzania. An online survey through a Google Forms sampling 842 respondents was adopted and responses were analyzed. Results indicate that there is an insignificant correlation of COVID‐19 with water and energy access in all the three countries. However, there is a significant relationship with food access in all the three countries though still minimal in Tanzania. Interestingly, there is an improvement in WASH due to increased local innovations and continued mass sensitization. The study highly recommends policies that could improve affordability and encourage innovations in the factors studied.

The study of the climate change and the effects of climate change induced extreme events on food security are fundamental for the sustainable development of agriculture globally. Climatic factors are the primary important factors affecting agricultural production. Furthermore, the world is now experiencing more frequent and intense droughts and floods in many agricultural regions which damage and at times destroy crops. The effects of climatic change on agriculture have triggered significant trend of research during the last decade globally in order to unfold the solutions to climate change induced extreme events on agriculture. Several studies have been conducted on effects of extreme events such as droughts and flooding induced by climate change on agriculture and food security. These effects include changes in crop and livestock yields as well as the economic consequences of these potential yield changes globally. Therefore, this study reviews the effects of extreme events, including floods and drought, caused by climate change on agriculture and food security with focus on Nigeria in particular. For the study, literatures were identified for review through a comprehensive search by using electronic and non-electronic databases to identify researches conducted on effects on climate change and extreme events on agricultural productivity. From the review, it shows that extreme events such as droughts and floods impact agriculture and food security. In order to mitigate the effects of climate change especially droughts and floods, on agricultural productivity, there is an urgent need to intensity efforts and researches on climate change to mitigate and adapt to the occurrences of these extreme events when necessary in Nigeria. Several mitigation and adaptation measures need to be implemented to mitigate the effects of extreme events on agricultural productivity and food security. These measures include practicing climate-smart How to cite this paper: Durodola, O.S.