Ocean pH Values: Past, Present, and Future Using two different data portals, students will learn and then analyze past, present, and future ocean pH values impacted by global CO2 levels. Students will explore how scientists use data to map changing levels of CO2 in the atmosphere and the effect on ocean pH levels. Students will interpret data of past pH levels in the ocean and future levels of ocean pH using CO2 level predictions gathering data from a NOAA website. Students will then compare their results to current pH values from GO-BGC float data. After analyzing these data sets, students will understand how changes in CO2 levels in the atmosphere affect ocean pH levels. Topics Biogeochemistry, Floats, Satellite Data Authors Mary Cahill Teacher ResourcesLesson PlanTeacher Slides Student ResourcesStudent Worksheet Additional ResourcesCalifornia Academy of Science Carbon Cycle Role PlayCarbon Cycle Demo CardsNOAA Global Monitoring Laboratory Next Generation Science StandardsCrosscutting ConceptsSystems and system modelsStability and change Core IdeasLS2.B: Cycles of Matter and Energy Transfer in EcosystemsESS2.D: Weather and ClimateESS3.D: Global Climate ChangePracticesAsking Questions and Defining ProblemsPlanning and Carrying Out Investigations Ocean Literacy Fundamental Concepts3: The ocean is a major influence on weather and climate.