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Climate topic
Marine
Marine brings together related events, pages and calendar moments inside Climate.
Within Climate, Marine looks at the ocean's role in the climate system: how seas absorb heat and carbon, why warming and acidification stress reefs and marine life, and how coasts adapt to rising seas.
Earth covered by ocean~71%
Excess heat absorbed~90%
CO₂ taken up~25%
Surface pH since 1800s−0.1
Named oceans5
Average depth~3.7 km
| Climate role | Largest heat and carbon sink |
|---|---|
| Main pressures | Warming, acidification, sea-level rise |
| At risk | Coral reefs, fisheries, coasts |
| Largest ocean | Pacific |
| Deepest point | Mariana Trench ~10.9 km |
| Why it matters | Drives weather and coastal life |
| Largest ocean coastlines | |
|---|---|
| Longest coastline |  Canada |
| Large EEZ |  United States |
| Island nation |  Iceland |
| Archipelago |  Indonesia |
Sea level rise
Long-term upward trend
1900low
1950
2000
2020high
World Reef Day