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Worldwide levels of carbon dioxide - the gas scientists say is most responsible for global warming - reached a significant milestone for the month of March, the National Oceanic and Atmospheric Administration said Wednesday. The global monthly average for carbon dioxide hit 400.83 parts per million in March, the first time the average surpassed 400 ppm for an entire month since such measurements began in the late 1950s, NOAA said.

Global carbon dioxide levels averaged 400.83 parts per million in March, marking the first time that atmospheric carbon has remained above the 400 ppm threshold for an entire month, according to the National Oceanic and Atmospheric Administration. "It's both disturbing and daunting," said NOAA chief greenhouse gas scientist Pieter Tans. 

2015 was Earth's hottest year on record, according to new data released Wednesday by NOAA and NASA. For the last 12 months the  average surface temperature across the globe was 58.47 Fahrenheit, a 0.23-degree increase from 2014's record-breaking average temperature of 58.24, the two agencies reported.

The National Oceanic and Atmospheric Administration (NOAA) released the results of what it calls the "annual checkup for the planet" Wednesday, and the patient is not doing well.

A study by the National Oceanic and Atmospheric Administration (NOAA) and the Cooperative Institute for Research In Environmental Sciences (CIRES) found that emissions from personal care products commuters use before leaving in the morning were roughly equivalent in magnitude to emissions from the tailpipes of their cars.

NASA found that 2016 was 1.78 degrees warmer than the mid-20th century average, while NOAA found 2016 was 1.69 degrees warmer than the 20th century average. The agencies use those pre-industrial periods as a set point for measuring climate change.

According to a study by the National Oceanic and Atmospheric Administration, the levels of carbon dioxide in the air increased by 3 parts per million during 2016, and levels have continued to increase during the first few months of 2017. NOAA scientist Pieter Tans said carbon dioxide levels have risen 100 times faster during the last decade than the during the transition from the last Ice Age.