Extreme Temperature Diary- Wednesday May 12th, 2021/ Main Topic: Yearly Peak Carbon Dioxide Statistics From Climate Central

The main purpose of this ongoing blog will be to track planetary extreme or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme or record temperatures as ETs (not extraterrestrials).😉

Main Topic: Yearly Peak Carbon Dioxide Statistics From Climate Central

Dear Diary. Every May the planet reaches an annual peak in CO2 levels because flora in the Northern Hemisphere becomes seasonally green and plentiful enough to draw down carbon through photosynthesis sufficiently to keep levels from going any higher well into the warm season. The exact opposite effect occurs during the fall once vegetation dies off enough so that a nadir occurs every November. Unfortunately both the nadir and zenith on the “Keeling Curve” keep getting higher each year due to the burning of fossil fuels.

This year our peak was around 421 parts per million in the atmosphere, so the first time in millions of years we witnessed this statistic above 420 with obvious big ramifications for our climate. Climate Central has compiled a nice set of statistics this year for the occasion. Here is their report issued this morning:


Yearly Carbon Dioxide Peak

MAY 12, 2021

Peak atmospheric carbon dioxide reached another record this year, and a new way to look at CO2 trends over the last 800,000 years—the Carbon Skyscraper—captures how pronounced human influence has been on the CO2 record.

See full multimedia package here >>KEY CONCEPTS | POTENTIAL STORY ANGLES


  • Carbon dioxide (CO2) and temperature go hand in hand. The more CO2 we pump into the atmosphere, the more our planet warms.
  • Once emitted, much CO2 remains in the atmosphere for hundreds to thousands of years, making it a powerful influence on the long-term warming trend. 
  • According to data from NOAA, daily peak CO2 reached just over 421 ppm (parts per million), up from 417 ppm last year at Mauna Loa.
  • It’s not just the record CO2 levels, but also the record pace. The Carbon Skyscraper graph focuses on CO2 change rates over the last 800,000 years, capturing the incredible speed and amount of CO2 that humans are pumping into the atmosphere.
Carbon Skyscraper

Carbon Skyscraper

Carbon & Temperature

Carbon & Temperature

Peak CO2

Peak CO2

Carbon dioxide (CO2) and temperature go hand in hand. Thanks in part to paleoclimatology research, scientists know that atmospheric CO2 levels regulate global temperatures. A quick peek at the Earth’s history shows us that when CO2 levels are high, global temperatures are high, and vice versa. Human-induced climate change follows this same principle: as we pump carbon emissions into the atmosphere, our planet warms. 

Once it goes up, it takes a long time to come down. Although other greenhouse gases like methane have a stronger warming potential, CO2 is influential because it stays in the atmosphere much longer (generally between 300 and 1,000 years). In other words, the day we stop polluting, our warming troubles won’t end—but at least they should stop getting worse. The more CO2 that accumulates in the atmosphere, the more warming we will see in the long-term. 

Where we are now: CO2 levels are climbing and our global temperatures are following suit. 

  • According to data from NOAA, daily peak CO2 reached just over 421 ppm (parts per million), up from 417 ppm last year at Mauna Loa.  
  • The last time CO2 levels were around this range was more than 3.6 million years ago, when the temperature was about 7°F hotter and the sea level was about 78 feet higher than today.
  • Global additions of CO2 to the atmosphere dropped about 7% in early 2020, but as restrictions and lockdowns ended, emissions returned to their normal climb.
  • The global average temperature is nearly 1.2°C (2.1°F) above the preindustrial baseline—edging ever closer to the 1.5°C Paris Agreement goal. 

The Carbon Skyscraper: It’s all about the rate. The rate of CO2 humans have emitted since the Industrial Revolution has no known rival in Earth’s history, yet the iconic 800,000 year CO2 graph understates our impact. Climate Central’s CEO, Benjamin Strauss, and Senior Computational Scientist, Scott Kulp, have a solution to fix that—the Carbon Skyscraper:

  • By focusing on the change in CO2 per period of time, instead of on the level, you can see the jaw-dropping rate at which humans have emitted CO2 in the last 100 years.
  • The Carbon Skyscraper is constructed by taking readings from the CO2 curve every 1,000 years going back from the present. See methodology for more. 
  • Speed foretells danger. The faster the climate changes, the less the ability of society and ecosystems to adapt. Yet, the speed and scale of human innovation and production can also create solutions, and today, we have the potential to move quickly to reduce emissions.

Read the full analysis


How are other greenhouse gases trending? What are the sources of greenhouse gases and carbon emissions?
Check out the Global Monitoring Laboratory to observe trends of greenhouse gases like carbon dioxide, methane, and nitrous oxide. To explore the different sources of greenhouse gases and carbon emissions, take a look at the EPA website. You can also use their interactive tool, Greenhouse Gas Inventory Data Explorer, to explore each sector and greenhouse gas. The US Energy Information Administration also has a breakdown of carbon emissions by state

What are some solutions to curb carbon dioxide levels?
Check out Solutions Journalism to read what your peers are reporting about carbon dioxide and carbon capture solutions. A search in their Solutions Story Tracker database displays stories like a startup company investing in direct air capture technologies and scientists researching the potential of genetically modified carbon-hungry trees.


The SciLine service500 Women Scientists or the press offices of local universities may be able to connect you with local scientists who have expertise on carbon emissions in your area. In addition, the American Association of State Climatologists is a professional scientific organization composed of all 50 state climatologists


  • Benjamin Strauss, Ph.D.,
    CEO and Chief Scientist, Climate Central
    Discussion topics: The Carbon Skyscraper
    Media Contact: Peter Girard, pgirard@climatecentral.org  
  • Ralph Keeling, Ph.D.,
    Director, Scripps CO2 Program
    Discussion topics: Keeling Curve, recent perturbations to the global carbon cycle
    Contact: rkeeling@ucsd.edu
  • Valerie Trouet, Ph.D.,
    Professor, Laboratory of Tree Ring Research, University of Arizona
    Discussion topics: paleoclimatology, long-term CO2 trends
    Contact: trouet@arizona.edu  
  • Matthew Lachniet, Ph.D.,
    Professor, Department of Geoscience, University of Nevada
    Discussion topics: paleoclimatology, long-term CO2 trends
    Contact: Matthew.Lachniet@unlv.edu (available for both Spanish and English interviews)


Carbon Skyscraper: 

For raw data on past CO2 concentrations, we used the Antarctic Ice Cores Revised 800KYr CO2 Data (Bereiter et al. 2015) from the World Data Center for Paleoclimatology, Boulder and the NOAA Paleoclimatology Program, accessed in May 2020. For the period from 8,877 – 67,257 years before present (2020), we swapped in more recent data from the WAIS Divide Ice Core Marine Isotope Stage 3 CO2 record (Brook 2020) at the US Antarctic Program Data Center. Full calculations and methodology explained here

Carbon Dioxide and Temperature Graph:

CO2 data is reported by NOAA’s Earth System Research Laboratory Global Monitoring Division. Calculations of average annual global temperature are performed independently at NASA and NOAA (among other groups). Climate Central combines these and compares temperatures to an earlier 1881-1910 baseline to assess warming closer to the preindustrial era.


Here is more climate and weather news from Wednesday:

(As usual, this will be a fluid post in which more information gets added during the day as it crosses my radar, crediting all who have put it on-line. Items will be archived on this site for posterity. In most instances click on the pictures of each tweet to see each article. The most noteworthy items will be listed first.)

Now here are some of today’s articles and notes on the horrid COVID-19 pandemic:

(If you like these posts and my work please contribute via the PayPal widget, which has recently been added to this site. Thanks in advance for any support.) 

Guy Walton “The Climate Guy”

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