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Compare countries
Method
What the site shows
The site shows what each country does with energy, what it emits, how clean its air is, how its economy trades, and how its people live. The map colours one number for every country. A click on a country opens its page with a chart of every number over time.
Where each number comes from
Every number comes from an open source that allows reuse with credit. A build downloads each source and turns it into small files. The site reads those files and does no other calculation.
Which value the map shows
The map and the table show the latest value of each country. That is the newest year with a number for that country, so two countries on one map can show two different years. A value more than 15 years older than the newest year of its metric is too old to compare: the map shows that country as "no recent data" in a grey hatch, and leaves the value out of the colour classes. The tooltip, the table and the country page still show that value with its year. The year is always written next to the value, as "as of". The build rounds each value, so the files stay small.
On a chart, a line breaks where the data stops for more than five years. A single year with no neighbour is drawn as a dot.
The dashed line after the data
Only the population chart has a dashed line after the data. It is the UN World Population Prospects 2024 projection to 2100, with the 95% interval that the UN publishes. The chart shows the part of it that fits the time axis. No other chart has a forecast or a trend.
When a source fails
The data is built every night at 02:23 UTC, and again after each change to the site. A download can fail. Then the build keeps the last good copy of that source from the live site and marks it "kept" in the list above, with the date of that copy. The site keeps working, and the other sources still update. The build stops only when a source has never had a good copy.