Increases in the amount of the greenhouse gas carbon dioxide in the atmosphere accelerated last year, the U.S. National Oceanic and Atmospheric Administration (NOAA) told Reuters on Wednesday....MOREVia CO2 Science:
Grape and Wine Responses to Atmospheric CO2 Enrichment
Bindi, M., Fibbi, L. and Miglietta, F. 2001. Free Air CO2 Enrichment (FACE) of grapevine (Vitis vinifera L.): Growth and quality of grape and wine in response to elevated CO2 concentrations. European Journal of Agronomy 14: 145-155.
...In the words of the three researchers, "elevated atmospheric CO2 levels had a significant effect on biomass components (total and fruit dry weight) with increases that ranged from 40 to 45% in the 550 ppm treatment and from 45 to 50% in the 700 ppm treatment." In addition, they report that "acid and sugar contents were also stimulated by rising CO2 levels up to a maximum increase in the middle of the ripening season (8-14%)," but they note that as the grapes reached the maturity stage, the CO2 effect on these parameters gradually disappeared. In terms of the primary pigments contained in the wine itself, however, we calculate from the bar graphs of their results that in response to the ~50% increase in atmospheric CO2 concentration experienced in going from ~363 to ~550 ppm CO2, the concentrations of total polyphenols, total flavoniods, total anthocyanins and non-anthocyanin flavoniods in the wine rose by approximately 19%, 33%, 31% and 38%, respectively.
What it means
Speaking of the future, Bindi et al. conclude that "the expected rise in CO2 concentrations may strongly stimulate grapevine production without causing negative repercussions on quality of grapes and wine." In fact, the ongoing rise in the air's CO2 content might even enhance the quality of the wine.