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
Researchers...
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...
Note on Pause in Daily Readings
June 14, 2016
Readings of CO2 from Mauna Loa have been unavailable for two weeks.
According to technicians with...
Why Has a Drop in Global CO2 Emissions Not Caused CO2 Levels in the Atmosphere to Stabilize?
May 23, 2016
Note: Readers have asked why there has been no stabilization in the measured levels of...
Comment on Recent Record-Breaking CO2 Concentrations
April 20, 2016
Levels exceeded 409 parts per million for the first time in recorded history this month
We...
