Ocean colour seen
As we belch carbon dioxide into our atmosphere, there's one natural way it's being cleaned up again - by plants.
Colourful ocean algae mop up thousands of tonnes of carbon, forming one of the most important and long-lasting removal routes for the greenhouse gas that's warming the planet.
But the sheer quantities of carbon dioxide are overwhelming the system.
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| The colour of our ocean is due to tiny plants called phytoplankton - they're also critical to our climate |
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