Carbon dioxide levels grew at record pace in 2016, U.N. says

A United Nations logo is seen on a glass door in the Assembly Building at the United Nations headquarters in New York City September 18, 2015. Reuters photographer Mike Segar
Current levels not seen for 3 million years
* CO2 levels hit 403.3 ppm, 45 pct above pre-industrial era
* CO2 was in 180-280 ppm range for hundreds of thousands of years
* Current levels not seen for 3 million years – U.N. bulletin
* Emissions hit record, ministers to meet in Bonn next month
By Tom Miles
GENEVA, (Reut