Waste is an indispensable by-product of most human daily activity. Prevailing waste management strategy, especially in developing countries such as Nigeria, is far below standard, resulting in environmental contamination and pollution which hampers sustainability. This forms the crux of the research paper which entails ascertaining how Waste-to-Energy can serve as a circular economy tool towards climate mitigation that will ensure environmental sustainability. Key challenges relate to moving beyond the perception of ‘waste as a problem’ to ‘waste as a resource’. Ultimately, both waste prevention, as well as a widespread growth in circular economy activities, will require a coherent and holistic approach that takes recovery options into account at every stage of the product life cycle. To achieve this, the study explored the potentials inherent in Waste-to-Energy (WtE) as a tool. The work is qualitative and involves a synchronic evaluation of previous research works relevant to the study to ascertain the viability of WtE as a circular economic tool for scaling back adverse environmental impact. Integration of results with detailed clarifications of circular economy and climate mitigation indicates WtE as an index of sustainable development. The bottom ash from combustion operations serves as feedstock to the construction industry, hence closing a potential pollution loop. Therefore, Waste-to-Energy is ascertained a viable tool that supports the circular economy while coupling with progressive externalities of climate mitigation. Thus, the study recommends that WtE as a tool should be duly considered as a key feature of climate change policy in developing countries, especially in Nigeria.

This study examined the relationship between Foreign Direct Investment (FDI) and the emission of CO2 in the Sub Saharan Africa. The literature focuses on foreign direct investments and C02 emission studies in various countries. Data was obtained for the World Bank database from 2004 to 2015, the general method of moment (GMM) model was used for estimating parameters with endogenous regressions in the panel data model to analyze our data. We found out that FDI has significantly influenced the emission of CO2 in the Sub Saharan Africa. The results demonstrated the heterogeneity of the effects of foreign direct investment on CO2 emissions, the impact of foreign direct investment on CO2 emissions is negative and significant. However, the general environmental impact of foreign direct investment is determined by indirect effects and appears to be positive. Moreover, natural resources endowment seemed not to play a key role in this relationship. Recommendations were given to ensure the usage of renewable energy by ensuring a sustainable economic growth.

CO2 levels are often seen as a major global problem faced by most countries; our study aims to examine the impact of Foreign Direct Investment on CO2 emission in Nigeria. Based on the “Pollution Heaven Hypothesis” and the “Pollution Halo Hypothesis” standards using the STARPAT standards model, this article assess the impact of economic factors on CO2 emission. Based on our findings, energy consumption is not sustainable in Nigeria, that is there is a high concentration of CO2 emission. U-lines with the traditional EKC data and the use of N-type foreign investments are now raising CO2 in Nigeria's cities through their “predictive” carbon emissions. Based on the results of previous studies, we report that changes are needed to be made in order to reduce carbon emissions in Nigeria which represent one of the challenges faced in developing countries.

The study focused on the long-term related effect among energy consumption (EC), CO2 production and economy growth (EG) of 12 randomly selected countries in sub-Saharan Africa. We used validation and causality tests in the 2008-2018 annual record. Special effects vary from country to country, in the long term, strong consumption of energy and economy growth in many countries has been linked with an increment in air pollution. The observation of the longitudinal study showed economic growth resulting in short-term CO2 emissions in Benin, the Democratic Republic of Congo, Ghana, Nigeria and Senegal, reflecting a lack of economy. This would not be possible without affecting the environment. The effect between CO2 and EG in Gabon, Nigeria and Togo has shown that environmental policies aimed at reducing pollution can be harmful. economic growth. In addition, long-term economic and CO2 production in Nigeria has been closely linked to the long-term links to Congo and Gabon. In the long-run, greenhouse gas emissions are the result of EC, EG and CO2 emission in Benin, Ivory Coast, Nigeria, Senegal, South Africa and Togo.