What's the strongest sequestration of Carbon that the earth gives us?

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The oceans are the largest carbon sinks on Earth.

Biomass (vegetation) comes second.

Each year the oceans release 88 billion tons of CO2 and absorb 90 billion tons - they are a sink for 2 billion tons of CO2.

Biomass releases 119 billion tons of CO2 each year and absorbs 120 billion tons - it's a sink for 1 billion tons of CO2.

Oh, 'strongest' not meaning largest. You're probably talking about diamonds....Show more

Diamonds definitely hold it better. There are lots of diamonds in the mantle. I wouldn't mind sequestering some of that form of carbon for myself. Oops, I see that was answered. Clearly it sequesters carbon. It doesn't sequester much carbon on the surface unless it gets subducted. I believe the greatest sequestering of carbon that is relatively recent and ongoing is formation of limestones and dolomites. Interestingly, when it warms, calcite is less soluble therefore the rate should increase when it warms.

Benjamin claims it takes 50 thousand years to sequester CO2 in rocks. Say what? It happens constantly....Show more

I want to take a bicarbonate after all this debate.I'll take a stab and say coal...but this was a edit and I like the question more then the points.The word strong leaves me wondering,as well as the term sequestration...There are many types but I think I'm on the same page.
Another edit: how about cobalt...I'm pulling hairs now and tapping my feet....hmmm what is this substance.You are so sneaky.
Another edit:(Dirt -earth-soil basic organic matter,If burned char.) I 'm done....Show more

--The oceans--

“The consumption of terrestrial vegetation by animals and by microbes (rotting, in other words) emits about 220 gigatonnes of CO2 every year, while respiration by vegetation emits another 220 Gt. These huge amounts are balanced by the 440 Gt of carbon absorbed from the atmosphere each year as land plants photosynthesise.

“Similarly, parts of the oceans release about 330 Gt of CO2 per year, depending on temperature and rates of photosynthesis by phytoplankton, but other parts usually soak up just as much – and are now soaking up slightly more.

“Human emissions of CO2 are now estimated to be 26.4 Gt per year, up from 23.5 Gt in the 1990s, according to an Intergovernmental Panel on Climate Change report in February 2007. Disturbances to the land – through deforestation and agriculture, for instance – also contribute roughly 5.9 Gt per year.

“About 40% of the extra CO2 entering the atmosphere due to human activity is being absorbed by natural carbon sinks, mostly by the oceans. The rest is boosting levels of CO2 in the atmosphere.”

Additional detail:

Rocks hold the largest reservoir of CO2, but it takes 50,000+ years to sequester all of the CO2 from anthropogenic sources in the atmosphere and oceans into rocks.

You are hinting at diamonds. They may be strong rocks, but they are not the strongest "sequestration" of carbon.

Sequestration means removal or separation (non chemistry definition). The oceans remove the most CO2 from the atmosphere on a daily basis. This is more relevant to the issue of global warming than chemical bonds in diamonds and graphite. I stand behind my first answer – the oceans are the strongest sequestration of carbon dioxide....Show more

For the sake of accuracy, graphite is a more stable form of carbon than diamond. Therefore, graphite is "stronger" than diamond as a sequestratian agent....Show more