[Moonman62]

First decimal place. Surface pH has decreased about 0.1 pH unit since the late 1800s.

So if it was 7.3, it's now 7.2? What are the actual numbers?

[cogitator]

So if it was 7.3, it's now 7.2? What are the actual numbers?

You're correct in the trend, but surface pH is in the 8.1 to 8.4 range. Deep ocean pH gets down to 7.5-7.6.