Example image of eyePlorer eyePlorer map for 'Kuznets curve': Economic inequality Simon Kuznets Economic development Physical capital Human capital Gini coefficient Per capita income Environmental policy Welfare capitalism Welfare state Cross-sectional data Latin America David Lempert Helix Neo-Malthusianism Environment (biophysical) Air pollution Water pollution Chlorofluorocarbon DDT Lead Nitrogen oxide Sewage Sulfur dioxide Ecological footprint Real gross domestic product Greenhouse gas Ecosystem services Carbon dioxide in the Earth's atmosphere Deforestation Desalination Israel Jubail Saudi Arabia Singapore Tragedy of the commons Alan B. Krueger Gene Grossman John Tierney Clean growth Leapfrogging EKC Inverted U Economic Freedom of the World Thomas Piketty Alexis de Tocqueville Economic growth