Many mitigation actions must be taken to limit climate change and achieve our climate goals. In addition to urgently needed emission reductions, the science shows that carbon dioxide removal (CDR) is also a necessary element of mitigation portfolios. Many climate policy makers are currently trying to decide what CDR options are appropriate within their jurisdiction. To evaluate whether or not a CDR option should be included in climate policy many criteria must be considered. However, understanding of CDR method potentials, feasibilities, risks, and desirability are limited. So far, the majority of CDR research has focused on land-based approaches. Less is known about ocean-based CDR approaches, even though these may be an option for many countries. Prior evaluations of CDR have mostly focused on potential, techno-economic feasibility, and governance with less consideration of what may be “desirable”. The German ASMASYS project is going beyond this by developing a transdisciplinary assessment framework for different marine CDR options that will include criteria for assessing both feasibility and desirability. Here I will present this framework and how we have begun working with it to evaluate marine CDR options. I will also discuss an effort to homogenize the assessment of potential ocean- and land-based CDR options.