Mauna Loa Observatory - Another CO2 Record

[Durian Fiend]

.. 422 ppm, now double the CO2 at the start of the Industrial Revolution...

I believe it's 50% higher now than back then.    

To find the last time earth was over 400 ppm takes a trip back in time to 16 million years ago.

[TomK]

I think that's more accurate and the right place to start since there wasn't any real evidence atmospheric CO2 levels were rising significantly before the Industrial Revolution. Before that time, there were around 280 parts per million but in just about a couple of hundred years they are now well over 400 and the rise is consistent with the amount of CO2 being pumped into the Earth's atmosphere by human activity. There aren't any other sources of CO2 that can explain this.

[ironyak]

Figured this was the right place for noting the corollary records being broken.

Last time there was this much CO2 in the atmosphere, temperatures were 4.5–7.2 degrees Fahrenheit (2.5–4 degrees Celsius) higher, and sea levels were 16 ft - 82 ft higher. We're about 1.5 deg C hotter than pre-industrial baseline now so more warming and sea level rise still to come just from past emissions.

Welcome to the globally hottest July ever in recorded human history, as well as one of coolest Julys of the rest of your life, but at least the beach is getting closer? ;) Probably worth doing something about...

Global land and sea temperatures in uncharted territory and

Last Sunday was the hottest day on Earth in all recorded history, climate agency finds
https://www.hawaiinewsnow.com/2024/07/24...ency-says/

"On Sunday, the Earth sizzled to the hottest day ever measured by humans, yet another heat record shattered in the past couple of years, according to the European climate service Copernicus Tuesday.

Copernicus’ preliminary data shows that the global average temperature Sunday was 17.09 degrees Celsius (62.76 degrees Fahrenheit), beating the record set just last year on July 6, 2023, by .01 degrees Celsius (.02 degrees Fahrenheit). Both Sunday’s mark and last year’s record obliterate the previous record of 16.8 degrees Celsius (62.24 degrees Fahrenheit), which itself was only a few years old, set in 2016.

Without human-caused climate change, records would be broken nowhere near as frequently, and new cold records would be set as often as hot ones.

“What is truly staggering is how large the difference is between the temperature of the last 13 months and the previous temperature records,” Copernicus Director Carlo Buontempo said in a statement. “We are now in truly uncharted territory and as the climate keeps warming, we are bound to see new records being broken in future months and years.”"

[HereOnThePrimalEdge]

Well that didn’t take long.
After Sunday’s record breaking hottest day on earth, the record was broken on Monday:

Monday was the hottest day ever globally, beating a record set the day before, as countries around the world from Japan to Bolivia to the United States continue to feel the heat, according to the European climate change service.

Provisional satellite data published by Copernicus on Wednesday shows that Monday was 0.06 degrees Celsius (0.1 degree Fahrenheit) hotter than Sunday.

https://apnews.com/article/hottest-day-e...33a832c694