Datasets that include a wide variety of variables for all or most countries in the world.
Datasets that include population size, population density, growth rates, age and sex structure, fertility rates, migration, contraception practices (including infanticide, abortion, sterilization, and the use of birth control technology)
Datasets that include life expectancy, morbidity and mortality, crude death rate, age/sex-specific death rate, infant mortality rates, maternal mortality rates
Datasets that include GDP, economic growth rates, inflation, productivity, percentage of women in the workforce, imports, exports, per capita income, labor force by industry, use of child labor, degree of urbanization, family and household structure.
Datasets that include air and water quality, soil quality, management and erosion, deforestation, desertification, changes in biodiversity waste disposal practices and consequences, availability of critical resources.
These sites provide indexing (for easier searchability) and full-text access to a wide range of data sets.