Consider the following equation:
GHG =
×
× G
where |
GHG = world's annual emissions of greenhouse gases |
Energy = amount of energy consumed globally per year
GDP = world's annual gross domestic product
The ratio Energy/GDP describes
◦ the number of units of carbon-based energy produced as a fraction of GDP.
◦ the number of units of energy used per dollar of GDP produced.
◦ the amount of energy used per unit of output in the energy-intensive sector of the economy.
◦ the energy efficiency of greenhouse gas emissions.
◦ the amount of energy per unit of GDP required to stabilize greenhouse gas emissions.