Public energy R&D spending and green energy for sustainable development: COP28 perspective of G7 economies

Achieving sustainable development goals (SDGs) is one of the top priorities for countries worldwide, and the recent COP28 has focused mainly on achieving sustainable development via clean energy investment financing. However, countries and regions still struggle to find various policy-level indicators to achieve sustainability engagement. In this context, finding the right combination of policy indicators becomes crucial. Therefore, the current study seeks to identify the key drivers of sustainability for the G7 economies by utilizing data from 1990 to 2019. This study employed the cross-sectional autoregressive distributed lag (CS-ARDL) panel time series method of estimating primary results and a novel sustainable development index as the dependent variable. The study revealed that public energy R&D budgets, increasing income levels, improving the political risk index, and promoting clean energy are important for achieving sustainable development in the G7 countries and that the depletion of natural resources has an adverse influence on sustainability. These empirical results are supported by various economic and environmental theories, i.e., the environmental Kuznets curve, the innovation theory of sustainability, the Dutch disease hypothesis, and the political economy of development and energy transition theory. Based on these findings, energy investment is recommended, especially for clean energy projects, and increasing income levels via sustainable economic activities to achieve sustainability in the G7 economies.