There seems to be a huge number of miscellaneous projects for a specific type of environmental restoration or some other activity that is specifically aimed at carbon sequestration. For example, seagrass restoration alone has a plethora(1,2,3). Is there a decent list of these projects? I found this cool list of CCS projects(4), but that’s different.
If such a list exists, I have another question: Is there an objective way to compare their effectiveness?
I'd suggest Carbon Brief as a good source covering some of them: carbonbrief.org
Finally the EU had a call out last year through the Horizon Europe funding program for research groups to create a framework for carbon removal. I believe they funded 2 or 3 different projects, one of which was focused on ocean-based projects. I can't find a link now, but they were €7mil+, 3-5 year projects, designed to comprehensively assess and compare all cdr options. They should have all launched this summer.