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Hawaii’s Mauna Loa Observatory has reported that worldwide carbon dioxide levels reached a new record high in April, hitting 410.31 parts per million (ppm). This is the highest concentration of this greenhouse gas seen over the course of human history–and prehistory, for that matter–as the Earth’s atmosphere hasn’t seen CO2 levels this high in well over 800,000 years, and possibly as long as 20 million years.
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A new study of seashells excavated from ancient glacial deposits in Scotland indicate that the region’s glaciers melted over a relatively short period of time–a period spanning only a few decades, and possibly as short as a matter of years–illustrating the abruptness of past climate change events, and how those events could serve as a warning as to how quickly our modern environment could also take an abrupt turn.
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According to the National Oceanic and Atmospheric Administration, global average surface temperatures for the first three months of 2018 have eased off of their record-breaking streaks seen in recent years, with January and March each being only the fifth warmest months for their respective months, and February coming in as the 11th hottest February in the 139-year record. While this trend looks good on the surface, NOAA points out that each of these months’ temperatures are still well above the 20th century average, meaning we’re still far from out of the global warming gutter.
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