Most applications of input-output (I-O) analysis to date have been to highlight inter-industry flows and to estimate the main aggregate national accounts, such as GDP, gross output and final demand categories. However, multiplier coefficients relating to output and income multipliers have hardly been explored especially in the Nigerian context. Sectors like agriculture, fishing, food & beverages as well as mining/quarrying have particularly significant roles and their economic impacts can be quantified using Nigeria's I-O table. The study adopted a longitudinal design and utilized the 2015 I-O table comprising of twenty-six (26) sectors obtained from Eurostat database. This table was used to compile an inter-industry transaction table and Leontief matrix, which was then used to derive industry-wise Type I and Type II multipliers for the aforementioned sectors. Type I multiplier takes into account the direct and indirect effects while the Type II multiplier captured the induced effects in addition to the direct and indirect effects. Mining/quarrying as a single sector had a Type I multiplier of 1.80 and 2.17 for both output and income respectively and a Type II multiplier of 2.41 and 3.12 for both output and income respectively. Similarly, the fishing sectors were identified to have the highest contributions (2.11 and 2.89 as well as 2.22 and 3.19) in both Types I and II multipliers for both output and income respectively when compared with other sectors.

In line with the Intergovernmental Panel on Climate Change (IPCC), we estimate the percentage carbon dioxide equivalent (CO 2 -eq) emissions by sector in Nigeria. In terms of its emissions, the percentage contribution of carbon dioxide, CH 4 and N 2 O to each sector were considered using the 2006 IPCC emission calculation default taking 2012 as the base year projected to 2027. Results revealed that, fugitive emissions from oil and gas accounted for the highest contribution to CO 2 -eq emissions with about 75.27% when compared to other sectors. This is due to increased gas flaring employed to dispose of associated gas in major petroleum/oil producing areas in the country. This sector pollutes because of their technology, the remaining sectors were identified as important sectors because of the weight they have on the economy. The study suggests the need for Nigerian government to ensure the security of fuel source for power generation by mandating oil companies to channel their flared gases to power plant.

This paper analyzed the percentage rise in final (sectoral) demand undergone by the whole economy in reaction to a 1% rise of the corresponding sector and the percentage rise corresponding to the apportionment of direct sectoral demand and its resultant effect on CO2-eq emissions in Nigeria. The study adopted a longitudinal design, and the most recent input-output (I-O) table was obtained from secondary sources (Eurostat database). Results revealed increases in CO2-eq emissions from the fishing, post and telecommunication, wood and paper, petroleum, chemical and non-metallic mineral products, metal products, electricity, gas and water, wholesale trade, and public administration sectors with a total contribution of 0.04095, 0.04095, 0.04089, 0.04088, 0.04086, 0.04089, 0.04088 and 0.04087 percent respectively, while sectors that contributed the highest in terms of the distribution of direct sectoral emissions were fishing, mining/quarrying and textile/wearing apparel accounting for about 0.04101, 0.04109 and 0.04111 percent respectively. That implies a 1% increase in final demand was increasing in the corresponding sector. Based on these results, the study identified sectors that contribute the highest in terms of the distribution of direct sectoral emission and sectors that account for the highest total increase in energy consumed in the country, thus contributing to the current debate in the literature. However, emission mitigation options proposed by the IPCC report should be considered an important option in curbing these emissions in Nigeria.