Differentiation This is an optional activity that you may skip if you have large numbers of special needs students. The content is interesting, but not essential for a basic understanding of the unit’s key goals. Modifications Extending the Learning Have students investigate the effects of ocean acidification: https://ocean.si.edu/ocean-life/invertebrates/ocean-acidification Discuss other information that students have seen about global carbon cycling and climate change in the media, and how it compares with what they have worked with in this lesson.