Your analogy doesn't work.
In percentage terms, atmospheric CO2 has increased ~0.014% since the pre-industrial age.
The soil being 0.014% more or less hydrated each year would make zero difference to the plant.
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@Marcob thank you for your response, but could you please share the source for such percentage of increase? The numbers I’ve found are significantly higher, regarding both the amount of CO2 and the ratę of it’s increase in recent years.


NOAA Climate.gov
Climate change: atmospheric carbon dioxide
In the past 60 years, carbon dioxide in the atmosphere has increased 100-200 times faster than it did during the end of the last ice age.
@Marcob here is another article I’ve found, if you do not trust government agencies and their data:


Time Scavengers
CO2: Past, Present, & Future
One of the common themes in the previous pages is the carbon dioxide, CO2, in our atmosphere and oceans. CO2 is it is one of the major drivers of l...