Edmonds M. auteur aut IRD Tutolo B. auteur aut IRD Iacovino K. auteur aut IRD Moussallam Yves auteur aut IRD text journalArticle eng text/pdf reformatted digital access Much of Earth's carbon resides in the "deep" realms of our planet: sediments, crust, mantle, and core. The interaction of these deep reservoirs of carbon with the surface reservoir (atmosphere and oceans) leads to a habitable surface environment, with an equitable atmospheric composition and comfortable range in temperature that together have allowed life to proliferate. The Earth in Five Reactions project (part of the Deep Carbon Observatory program) identified the most important carbon-bearing reactions of our planet, defined as those which perhaps make our planet unique among those in our Solar System, to highlight and review how the deep and surface carbon cycles connect. Here we review the important reactions that control the concentration of carbon dioxide in our atmosphere: outgassing from magmas during volcanic eruptions and during magmatic activity; and uptake of CO2 by alkaline surface waters. We describe the state of our knowledge about these reactions and their controls, the extent to which we understand the mass budgets of carbon that are mediated by these reactions, and finally, the implications of these reactions for understanding present-day climate change that is driven by anthropogenic emission of CO2. specialized Deep carbon cycle anthropogenic carbon alkaline lakes CO2 degassing silicate melts Earth in Five Reactions: A Deep Carbon Perspective 064 062 066 105 1 28-34 2020 0003-004X https://www.documentation.ird.fr/hor/fdi:010077499 10.2138/am-2020-6986CCBY 0003-004X [F B010077499] https://www.documentation.ird.fr/hor/fdi:010077499 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-01/010077499.pdf IRD - Base Horizon / Pleins textes 2020-02-05 2020-03-09 fdi:010077499 fre