This study examines long-term rainfall and temperature variations over a dry tropical environment in Nigeria. An assessment of the variations of these weather variables showcases the extent of climate change limits and corresponding effects on the biotic environment. Rainfall and temperature data were obtained from Nigerian Meteorological Agency for a period of 31 years (1991-2020) for Kano and Katsina States. Descriptive statistics were used to determine the degree of variability of the weather variables across spatial domains. Results showed that there is a sharp contrast in mean annual rainfall amounts of 1154.1 mm and 569.6 mm for Kano and Katsina located in the dry continental and semi-arid climate zones of Nigeria respectively. It is revealed that the month of August had the highest mean monthly rainfall for both areas i.e. 359 mm and 194 mm with little or no trace during the dry season. The sharp difference in rainfall amount across spatial domains of the near similar climate zones shows that the Inter-tropical Discontinuity (ITD) does not completely overwhelm the northern band of Nigeria in August. The least variable monthly rainfall was in August and July with coefficient variations (CV) of 40% and 47% for Kano and Katsina. The months of February and March had the highest CV of 557% and 273% for the respective areas. In the examined areas the wet and dry seasons are from June-September and October-May respectively. The index of rainfall variability and drought intensity for the areas ranged from 0.85-0.95 and 45% indicating moderate variability and drought respectively. Mean annual temperature values are 33.4 °C and 33.8 °C for Kano and Katsina. The study recommends a proper climate observing scheme, most especially for agrarian practices so as to ensure profitable outputs for human sustainability.

This study analyses diurnal weather patterns in the lower atmosphere across four climate domains in Nigeria from Era-Interim data for synoptic hours of 0000, 0600, 1200 and 1800 hours from 2010-2015. The climate domain includes: Port Harcourt (tropical maritime), Enugu (bi-modal tropical continental), Jos (montane), Kano (mono-modal tropical continental) and Maiduguri (semi-arid). Findings revealed that air temperature across the areas indicate strong latitudinal positions with drier and hotter weather pattern northwards. Average air temperature across diurnal hours were 23.2-26oC, 23-29oC, 26-32oC, 26-34oC and 26.6-34 oC for Port Harcourt, Enugu, Jos, Kano and Maiduguri. Average solar radiation peaked at 1200 noon with values 508 W/m2, 639 W/m2, 830 W/m2, 905 W/m2, 832 W/m2 for the areas. Average wind speed increases northwards, i.e. 0.9-1.3m/s, 2.0-2.5m/s, 2.1-2.5m/s, 2.4-3.0m/s and 2.9-3.5m/s respectively. The wind variation is due to the surface characteristics across the areas. Southwesterly winds dominated coastal zone while southeasterly/northeasterly winds dominated the arid zone except during periods of peak rainy season. Average cloud cover for the coastal and northern domains in oktas was: 6-7 and 2-4. Relative humidity shows that prevailing atmospheric conditions at any given time are stronger at the areas close to the sources of influence and the position of Intertropical discontinuity (ITD). Humidity values were: 67-93% and 31-71% for coastal and northern domains. Rainfall amount reduces northwards i.e. 200-46 mm. Rainfall pattern is significantly influenced by the air masses source regions. These regions include closeness to massive water bodies, proximity to Sahara Desert and effects of mountainous barriers.

This work mapped the research chronology and conceptual trends on conservation agriculture-soil health-sustainable development goals nexus by analyzing data from related literature. This is the first-time different bibliometric methods such as VOSviewer, Flourish, as well as Bibliometrix and Biblioshiny models in RStudio were simultaneously used to investigate the research impacts and/or interactions between conservation agriculture (CA), soil health and sustainable development at global scale. On 20th February 2024, a search was launched on the web of science core collection using related search terms to extract relevant data. After the screening and elimination, the search produced 835 papers which were used in the bibliometric analysis. The revealed that USA (31%), India (27%), Australia (7%), England (6%), China (6%), Canada (5%), and other countries had below 5% of the published documents. Many of the papers covered zero hunger (38%), climate action (30%), life on land (26%), while other SDGs had relatively low coverage. The study found the adoption of no till, cover cropping, and organic amendments by the authors as the common CA practices. The hybrid bibliometric approach provided a clear roadmap in understanding the global research trajectory on CA-soil health and SDGs nexus, as well as the roles of countries, authors, institutions, publishing journals. This knowledge could support in championing future debates on CA potential for effective discussion and policies, especially in the developing countries where there have been low publications.

It is emphasized that global warming and climate change vary directly with the increase in the concentration of greenhouse gases, particularly carbon dioxide across domains. The constructions of social and economic infrastructures in developing counties such as Nigeria at a higher rate increases the emissions of carbon dioxide (CO2) into the lower atmosphere. Non-road construction equipment sources powered by fossil fuels are considered to be primary emitters of greenhouse gases during the construction stages of large infrastructure project. In this study, inventory of non-road construction machinery emissions from the Tank junction flyover construction site along East-West Road in Port Harcourt metropolis were estimated via field data gathering. Results showed that an average of about 398.7 g/s (4134.4 ton/year) of CO2 is released from the construction site in Port Harcourt, Nigeria. Among the various types of non-road engines considered, the mobile crane was the largest single contributor to the total CO2 emissions, accounting for 18.5%. Machinery with power above 300 kW were 8 out of 30 equipment on site and accounted for the largest share (52.87%) of total CO2 emissions. Based on the findings from current research literature and the case study, control strategies such as enforcing standards and policy, conducting impact assessment, adopting low carbon technology, and restricting energy utilization need to be implemented in other reduce the impact of global warming and alleviate climate change. Therefore, CO2 emission mitigation plans and schemes are necessary alongside standardized frameworks and guidelines. All stakeholders must play their roles efficiently to reduce CO2 emissions and aid in mitigating the effects of climate change.

Rapid urban growth has outpaced municipal solid-waste services in African cities, increasing uncontrolled disposal and environmental and health risks. This scoping review mapped relationships among waste-governance conditions, service and infrastructure failures, environmental and socio-economic externalities, circular economy interventions and financing mechanisms. Searches of Scopus, Web of Science, ScienceDirect, SpringerLink, Google Scholar and institutional sources were conducted between 10 March and 20 August 2026. Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews (PRISMA-ScR), 734 records were identified, 187 full texts were assessed and 85 sources were included. Evidence was coded by city, waste type, management stage, source characteristics, authorship origin and five analytical domains. The comparative analysis covered Lagos, Accra, Dakar, Freetown, Nairobi, Kampala, Harare, Maputo and Johannesburg. Inadequate collection, uneven service coverage, fragmented institutional responsibilities and poorly controlled disposal were consistently reported failures. Documented effects included drainage obstruction and flooding, atmospheric emissions, soil and water contamination and community and occupational exposure. Informal workers were central to documented material recovery, although recognition and protection remained limited. Financing evidence was strongest for household charges, revenue, private collection contracts and development-funded projects; green bonds,Environmental, Social, and Governance (ESG)-aligned finance and smart technologies remained prospective. Operational examples included organic-waste recovery in Freetown and landfill-gas infrastructure in Johannesburg. Financing and technology were linked to specific waste streams, facilities and management stages. Sustainable improvements require financing arrangements designed for the service failures and infrastructure needs documented in each city. The evidence base was predominantly English language and geographically concentrated in West, East and Southern Africa; North and Central African cities were not represented among the focal-city comparisons.