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The acceleration of ecological footprint and trade openness are two major hot subjects that have received much attention in recent years. Thus, the current study evaluates the interrelationship between ecological footprint and trade openness in Mexico, Indonesia, Nigeria, and Turkey (MINT) nations. The study utilized time series and panel analysis between 1961 and 2018. The research provides thorough information regarding this relationship for various time and frequency sub-periods by employing the partial wavelet, wavelet coherence, and multiple wavelet coherence techniques. The results from the wavelet coherence show that in the short and medium term, there is significant co-movement between ecological footprint and trade openness for Mexico and Indonesia, with trade openness driving ecological footprint positively at high and medium frequencies. Moreover, at all frequencies, trade openness drives ecological footprint positively for Nigeria and Turkey. The study validates that trade openness leads to the ecological footprint hypothesis in each nation. Furthermore, the multiple and partial wavelet coherence undoubtedly strengthens the occurrences spotted through the wavelet coherence in each nation. Based on these findings, policy recommendations are put forward.

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The pursuit of decarbonization has created an awareness globally in relation to geothermal energy, either for electricity generation or direct usage, since fuel combustion is not needed. Premised on this intriguing detail, this present research scrutinizes the impact of geothermal energy on CO2 emissions in the top seven geothermal energy-consuming nations. Using the quarterly dataset of geothermal and CO2 emissions stretching over the period between 1990 and 2019. The quantile-on-quantile (QQ) approach, which considers the conventional quantile analysis and nonparametric, is utilized in this research to provide more accurate and robust estimations. Furthermore, the QQ approach differentiates the impacts of geothermal energy on CO2 emissions into three quantiles: upper, medium, and lower. Additionally, the nonparametric causality-in-quantiles is used to evaluate the causation in quantiles between geothermal and CO2 emissions. From the outcomes of the QQ approach, we discovered that in several quantiles, geothermal energy mitigates environmental deterioration, wherein CO2 emission is reduced in Italy, Mexico, and New Zealand. However, geothermal energy boosts CO2 emissions in India, the USA, Turkey, and the Philippines. Furthermore, the nonparametric causality-in-quantiles discovered that geothermal energy predicts CO2 emissions in all nations.

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