Session of Interest: 

Ocean Acidification and its consequences: past, present and future (ss-20 Environmental Geology)

Session description: Ocean Acidification (OA), the broadscale change in ocean pH associated with changes in atmospheric chemistry, is considered the “evil twin” of modern anthropogenic climate change. Recent re-analyses of mass extinction events and other events in the deep-time history of Earth have revealed tight linkages between atmospheric/ocean temperature and chemistry change and biotic consequences, with long-term evolutionary responses in some cases. A deeper understanding of the chronologies and mechanisms of these atmospheric/ocean chemistry changes and their biotic consequences in the past is valuable for understanding OA in the Anthropocene, and modelling OA responses in the 21st century and beyond. This special session seeks submissions investigating all aspects of OA and its ecological, evolutionary, oceanographic and stratigraphic consequences, throughout Earth History.

Conference website: https://event.fourwaves.com/stjohns2026/pages or https://gac.ca/events/gac-mac-annual-meeting/​

About the Symposium (from website):

"Ocean acidification remains a central theme of the symposium series. This edition will also expand to consider other ocean climate impacts, such as ocean warming and deoxygenation, particularly in a multiple-driver context. Research on marine carbon dioxide removal interventions, which are suggested to mitigate climate change and ocean acidification, will also be a key part of the conference."

​

Themes:

• Beyond tipping points - translating science to action

• Global-driven changes in biodiversity and ecosystem resilience

• Multiple stressors' effects on marine organisms

• Ocean-based solutions

• Technological advances in marine climate change research

• The modulating role of time - from short-term variability to evolution

• Working across knowledge systems in a high-CO₂ world

​

Abstracts are due April 1, 2026.

​

Call for abstracts

Special Sessions - includes "Ocean acidification multiple stressor effects on North American species"