Extra H⁺ ions bind with carbonate (CO₃²⁻), which marine animals need to build shells.

Extra H⁺ ions bind with carbonate (CO₃²⁻), which marine animals need to build shells.

Extra H⁺ ions bind with carbonate (CO₃²⁻), which marine animals need to build shells. Impacts of ocean acidification Image : NOAA Environmental Visualisation Laboratory Less carbonate = weaker shells and struggling marine life.