Answers to questions:

Carbon dioxide emissions are those stemming from the burning of fossil fuels and other man-made sources and are measured in metric tons. The UN Common database contains 3 tables each of data for CO2 emissions per capita and CO2 emissions in total. Each pair of tables reports data for most countries to a different standard. However data for Chile is only reported from one source, the Carbon Dioxide Information Analysis Center (CDIAC), which is the global-change data and information analysis center of the U.S. Department of Energy. The World Bank uses the Carbon Dioxide Information Analysis Center at the Oak Ridge National Laboratory in Tennessee as the source of its CO2 emissions data.

The World Bank data for total CO2 emissions for Chile starts in 1960, whereas the UN data starts in 1980. The actual data values vary by a tiny amount between the two databases (under 0.2%), but the trends are the same.