Scripps CO2 Instrument at Mauna Loa Observatory Back in Action
March 16, 2023
Helicopter delivers photovoltaic rails, electrical conduit, and solar panels to Mauna Loa Observatory. Photo: Scott...
Update on CO2 readings commencing at Maunakea
January 10, 2023
(Above: Ralph Keeling takes an air sample at Maunakea Dec. 21, 2022)
The Keeling Curve data...
Historic Keeling Curve Observation Interrupted by Volcanic Eruption
November 29, 2022
The carbon dioxide measurement equipment that maintains the famed Keeling Curve record lost power...
Why COVID Didn’t Have a Bigger Effect on CO2 Emissions
May 3, 2021
Photo: Robert Labrecque
The COVID-19 pandemic caused carbon dioxide (CO2) emissions from fossil fuels to drop...
Statement from Scripps Oceanography, UK Met Office on Record High CO2 Buildup
April 7, 2021
Researchers Richard Betts from the UK Met Office Hadley Centre and Ralph Keeling of Scripps...
Notice on revised CO2 scale
March 9, 2021
As of February 21, 2021, the CO2 data from the Scripps CO2 program are reported...
What does it take for the coronavirus (or other major economic events) to affect global carbon dioxide readings?
November 18, 2020
A downturn in global fossil fuel use has been prompted by curtailments of travel and...
Carbon Dioxide Levels Hit Record Peak in May
June 4, 2019
Monthly average surpassed 414 parts per million at Mauna Loa Observatory
Atmospheric carbon dioxide continued its...
Is the Current Rise in CO2 Definitely Caused by Human Activities?
September 19, 2018
A correspondent recently asked Keeling Curve researchers to settle a family disagreement about the cause...
Another Climate Milestone Falls at Mauna Loa Observatory
June 7, 2018
Peak carbon dioxide levels surpass 411 parts per million for May
Carbon dioxide levels measured at...
Carbon Dioxide in the Atmosphere Hits Record High Monthly Average
May 2, 2018
April monthly average exceeds 410 parts per million for the first time in recorded history...
Video: How Scientists Measure Carbon Dioxide
April 12, 2018
In honor of the 60th anniversary of the Keeling Curve, Ralph Keeling of the Scripps...
Rising CO2 Leading to Changes in Land Plant Photosynthesis
September 14, 2017
Suggests that plants have achieved an optimum response to rising CO2 levels in the atmosphere
Note on Reaching the Annual Low Point
September 23, 2016
We are now approaching the annual low point in the Mauna Loa CO2 curve, which...
Brief Reprieve from 400 PPM Era May Be Thanks to a Hurricane
August 31, 2016
A hurricane bearing down on Hawaii prompted operators to shut down CO2 monitoring equipment at...
Daily Readings Have Been Restored
June 21, 2016
A failed disk that had prevented the reporting of daily readings was replaced on June 14...