The world hit another new record high for heat-trapping carbon dioxide in the atmosphere, despite reduced emissions because of the coronavirus pandemic, scientists announced on June 4.

Measurements of carbon dioxide, the chief human-caused greenhouse gas, averaged 417.1 parts per million (ppm) at Mauna Loa, Hawaii, for the month of May, when carbon levels in the air peak, the National Oceanic and Atmospheric Administration (NOAA) said. That's 2.4 ppm higher than a year ago.

Mauna Loa Observatory is a premier atmospheric research facility that has been monitoring data related to atmospheric change since 1958.

Even though emissions of carbon dioxide from the burning of fossil fuels dropped by as much 17 percent in April, it was a brief decline. Carbon dioxide can stay in the air for centuries, so the short-term reductions of new carbon pollution for a few months didn’t have much of a big picture effect, said NOAA senior scientist Pieter Tans.

"It illustrates how difficult it is — what a huge job it is — to bring emissions down," Tans said. "We are really committing the earth to an enormous amount of warming for a very large time."

Any slight changes in measurement of carbon dioxide in the atmosphere could bring the global temperature to a higher record. If the measurement exceeds 450ppm, the global temperature could increase by two degrees Celsius.

Records with direct measurements go back to 1958. And carbon dioxide levels are now nearly 100 ppm higher than then. That's a 31 percent increase in 62 years.

"The rise in atmospheric carbon dioxide levels is relentless, and this means the costs of climate change to humans and the planet continue to rise relentlessly as well," said University of Michigan environment dean Jonathan Overpeck.

Carbon levels in the air were higher in the distant past before humans, Tans said.

Carbon dioxide levels peak in May starting in late May, because growing plants suck up more of heat-trapping gas, causing carbon amounts in the air to drop, Tans said.

(Cover image via AP.)

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