Credit: Robert Evans, bobevansphotography.com The waters around North America may soon become hostile to key marine species if acidification in the Northeastern Pacific continues at its current pace, a new study warns. Earth’s oceans have grown about 30% more acidic since the Industrial Revolution began over two centuries ago. As acidity rises, marine chemistry shifts and essential minerals disappear—minerals that corals, clams, and other calcifying organisms rely on to build