[ProDigit]

Well, I do think it matters. The rain grabs a lot of CO2 and brings it to the ground. Here in FL, it's very visible! With a long time no rain, there's a lot of stuff flying around in the air. Rain cleans the air, and also grabs carbon from CO2 and releases it in the sand. After a rainy day, here in FL, the earth looks blacker for a while (not because it's wet).

It's especially visible, when they are burning some forests in the everglades!
Carbon goes into the air, and gets deposited by the rain, in my garden (I'm living a good 15-20 miles from those burning areas)!

The majority of the Carbon will be absorbed by the sand, and the surface waters will evaporate, and the deeper waters will get filtered by the ground, and go into rivers.
River water will not become much more acidic, as most carbon will be filtered out of the water before it reaches the rivers by the earth.
But even if not, more more carbon, more acid, more plankton, more river life that feeds on plankton, more bigger fish that feed on smaller fish that feed on plankton; the more humans that will fish for fish, the more humans, means the more carbon pollution.

Carbon is also an excellent reflector or absorber of UV rays. Less UV rays will enter the atmosphere. The bad is that the ozon layer may shrink (the hole in the ozon layer), and in areas with a lot of pollution they will not suffer the consequences.
In area's like rain forest, even they will not suffer much, because they're sheltered from it, by the trees. However in farm lands, it'll become a nightmare. crops die, people die of cancers, and less crops mean less humans.