With the escalating Red Sea conflict, it is increasingly clear that we might be in it for the long haul, forcing shipping lines into round-of-Africa routings for the foreseeable future. A direct consequence of this is an increase in CO2 emissions. There are three elements to consider: Increase in emissions due to longer sailing distances, potential increases due to faster sailings speeds (to maintain weekly departures), and if there is a shift from large vessels to smaller, less fuel-efficient vessels. Using a proxy container service, we can estimate the scale of these increase in CO2 emissions. (....)