Table 1.

Data used

Representation	Variables	Unit of measurement
ECON	Energy consumption	Energy use (kg of oil equivalent per capita)
CO2	Carbon dioxide emission	CO2 emissions (metric tons per capita)
N2O	Nitrous oxide emission	Nitrous oxide emissions (thousand metric tons of CO2 equivalent)
GDP	Gross domestic product per capita	GDP per capita (constant 2010 US$)
GDPSQ	Squared GDP per capita	GDP per capita squared
METH	Methane emission	Methane emissions (kt of CO2 equivalent)

Sources: World Bank, World Development Indicators. All the variables with the exception methane were converted to their log form