Table 1.

Variable, measurement, and source.

Variable	Measurement	Source
Ecological footprint	Global hectares per person	Global Footprint Network (GFN)
Economic Growth (GDP)	Real Gross Domestic Product (GDP) per capita (Constant, 2010 USD).	World Development Indicators
Renewable Energy (RE)	Share of renewables to total primary energy supply in Thousand toe (tonne of oil equivalent)	OECD
Investment in Renewable Energy R&D(REI)	Research Design and Development (RD&D) expenditure in renewable energy technologies (constant 2019 US Dollars and exchange rates)	IEA

Source: Authors' computation