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2016 broke world records for temperature and CO2 levels

The average annual concentration of carbon dioxide in the atmosphere last year broke 400 parts-per-million (ppm) for the first time — in both modern direct measurements and ice core records dating as far back as 800,000 years — according to a major report on 2016 climate conditions released Thursday.

Data: National Oceanic and Atmospheric Administration; Chart: Andrew Witherspoon / Axios