So-called “ocean acidification” is having deleterious effects on marine biology. Now, environmentalists are raising concerns about freshwater acidification, which too, could have a serious impact on aquatic life. However, currently there is a shortage of data to support this.
The evidence for it happening is from only four reservoirs in the Ruhr region of Germany. Scientists investigating other places, such as the UK’s Lake District have not detected any manifestation of it.
This seems to confirm the consensus, held for a long time, that freshwater is not as susceptible to acidification by carbon dioxide as is seawater. The acidity of the reservoirs in Germany is far less than during the acid rain crisis in the 1970 and 1980s. At the current rates, it will take many decades for absorbed carbon dioxide to raise freshwater to those levels, so there is probably little reason for concern.