Carbon dioxide levels reach highest in human history

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Over the weekend, the climate system sounded simultaneous alarms. Near the entrance to the Arctic Ocean in northwest Russia, the temperature surged to 84 degrees Fahrenheit (29 Celsius). Meanwhile, the concentration of carbon dioxide in the atmosphere eclipsed 415 parts per million for the first time in human history.

By themselves, these are just data points. But taken together with so many indicators of an altered atmosphere and rising temperatures, they blend into the unmistakable portrait of human-induced climate change.

Saturday’s steamy 84-degree reading was posted in Arkhangelsk, Russia, where the average high temperature is around 54 this time of year. In Koynas, a rural area to the east of Arkhangelsk, it was even hotter on Sunday, soaring to 87 degrees (31 Celsius). Many locations in Russia, from the Kazakhstan border to the White Sea, set record-high temperatures over the weekend, some 30 to 40 degrees (around 20 Celsius) above average. The warmth also bled west into Finland, which hit 77 degrees (25 Celsius) Saturday, the country’s warmest temperature of the season so far.

Meanwhile, in Greenland, the ice sheet’s melt season began about a month early. In Alaska, several rivers saw winter ice break up on their earliest dates on record.

Data from the Japan Meteorological Agency show April was the second warmest on record for the entire planet.

These changes all have occurred against the backdrop of unremitting increases in carbon dioxide, which has now crossed another symbolic threshold. Saturday’s carbon dioxide measurement of 415 parts per million at Hawaii’s Mauna Loa Observatory is the highest in at least 800,000 years and probably over 3 million years. Carbon dioxide levels have risen by nearly 50 percent since the Industrial Revolution.

Carbon dioxide is a greenhouse gas that, along with the rise of several other such heat-trapping gases, is the primary cause of climate warming in recent decades, scientists have concluded.

Eighteen of the 19 warmest years on record for the planet have occurred since 2000, and we keep observing these highly unusual and often record-breaking high temperatures. They won’t stop soon, but cuts to greenhouse emissions would eventually slow them down.

[The Washington Post]

This entry was posted in by Grant Montgomery.

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