https://wiki.climatefresk.org/en/api.php?action=feedcontributions&feedformat=atom&user=ArnaudOClimate Fresk - User contributions [en]2026-04-26T19:04:16ZUser contributionsMediaWiki 1.39.3https://wiki.climatefresk.org/en/index.php?title=En-en_adult_card_11_concentration_of_co2&diff=840En-en adult card 11 concentration of co22022-10-27T20:56:14Z<p>ArnaudO: /* CO2 elimination */</p>
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<div>== Card #11: Concentration of CO<sub>2</sub> ==<br />
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[[File:En-en_adult_card_11_front.png|400px]]<br />
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About half of CO<sub>2</sub> emissions are captured by natural carbon sinks. The other half remains in the atmosphere. The concentration of CO<sub>2</sub><br />
in the air has increased from 280 to 415 ppm (parts per million) over the past 150 years. This is higher than at any point over the last three million years.<br />
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== Explanation==<br />
CO<sub>2</sub> measurements have been taken since 1958 in Hawaii, on Big Island, on the flanks of the Mauna Loa volcano. They were initiated by Charles Keeling. In the blue scenario (2°C) they increase until 2040-2050, then they decrease because emissions will have been reduced so much that natural sinks no longer absorb them.<br />
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== Correction==<br />
===Causes===<br />
* [[En-en_adult_card_12_carbon_sinks|Carbon Sinks]]<br />
=== Consequences ===<br />
* [[En-en_adult_card_13_additional_greenhouse_effect|Additional Greenhouse Effect]]<br />
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== Wrong links==<br />
===Wrong consequences===<br />
*[[En-en adult card 12 carbon sinks|Carbon sinks]] It can be argued that CO<sub>2</sub> emissions take place before reaching carbon sinks. But the opposite link has our preference.<br />
*[[En-en adult card 24 ocean acidification|Ocean acidification]] Players often identify CO<sub>2</sub> concentration as a cause for ocean acidification. But it is more logical to link back to carbon sinks.<br />
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==To go further==<br />
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===CO<sub>2</sub> elimination===<br />
The surplus CO<sub>2</sub> is permanently stored in the atmosphere (no chemical degradation process). There are only 2 physical processes: dissolution of CO<sub>2</sub> in the oceans, and synthesis of O<sub>2</sub> via photosynthesis (in the presence of photons). <br />
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Therefore<ref>[https://www.ipcc.ch/site/assets/uploads/2018/02/WG1AR5_all_final.pdf#page=489 IPCC Climate Change 2013 Report]</ref>:<br />
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*in 100 years' time, 40% of the surplus CO<sub>2</sub> released today will still remain in the atmosphere<br />
*in 1000 years' time, 20% of the surplus CO<sub>2</sub> emitted today will still remain in the atmosphere<br />
*in 10,000 years' time, 10% of the surplus CO<sub>2</sub> emitted today will still remain in the atmosphere.<br />
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It is an almost irreversible process.<br />
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===French emission factors===<br />
In France, the main cause of CO<sub>2</sub> emissions has shifted from industry to transportation in 150 years.<br />
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==References==<br />
<references /><br />
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[[fr:Fr-fr_adulte_carte_11_concentration_en_co2]]</div>ArnaudO