It's the chocolate! :D

More than all three ecosystems compared. It is as much as a bar of chocolate weighs, more precisely110-170g C per square metre per year, according to British studies.

Source:

Ouyang, X. and Lee, S. Y.: Updated estimates of carbon accumulation rates in coastal marsh sediments, Biogeosciences, 11, 5057-5071, https://doi.org/10.5194/bg-11-5057-2014, 2014. Last accessed 08/05/2023.