Provides data for Kaya identity variables (population, gross
domestic product, primary energy consumption, and energy-related
CO2 emissions) for the world and for individual nations, and
utility functions for looking up data, plotting trends of
Kaya variables, and plotting the fuel mix for a given country
or region. The Kaya identity (Yoichi Kaya and Keiichi Yokobori,
"Environment, Energy, and Economy: Strategies for Sustainability"
(United Nations University Press, 1998) and
) expresses a nation's
or region's greenhouse gas emissions in terms of its population,
per-capita Gross Domestic Product, the energy intensity of its
economy, and the carbon-intensity of its energy supply.