# Could we sequester co2 by dumping forests in deep oceans?

We know that trees are the most efficient "tool" we have to get CO2 out of the air, but the problem is that most of their fixated CO2 will naturally reenter the carbon cycle through decomposition. Would it be possible to remove this carbon by sinking the trees deep underwater (and possibly putting some rocks / sand on them)? How effective would this be, if at all? (I was unable to find any studies on this, if there are please point my to them.)

Update: I found a study regarding wood burial on land, for those interested. This might or might not be easier than under water, are there are any field trials either way? https://cbmjournal.biomedcentral.com/articles/10.1186/1750-0680-3-1

• Effective? Not at all. Transportation alone would require enormous amounts of energy. – Jan Doggen Aug 6 '19 at 13:03
• Well, if wood didn't float... – jeffronicus Aug 6 '19 at 14:47
• en.wikipedia.org/wiki/Deep-sea_wood – Keith McClary Aug 7 '19 at 3:45
• Where did you take this "most efficient tool" info? What about storing Co2 by restoring wetlands? Peat is a great Co2 sink too. – J. Chomel Aug 7 '19 at 7:44
• Just some back-of-napkin-calculation. As you need no further energy inputs into trees, that is an adavantage and scalable. aps.org/policy/reports/assessments/upload/dac2011.pdf pg 13 gives est. 600$/ ton of Co2 captured, though this may be somewhat outdated. To capture the same amount from a forest you would need between 250-500 m2 tropical forest for a year (data found in here creaf.uab.cat/Global-Ecology/Pdfs_UEG/2019%20GloChaBiol4.pdf). The main cost would probably not be land but forest work (land maybe 0,25$/m2?). Peat is great, yes, but we need diverse approaches – Quote Aug 8 '19 at 11:38