There is a frustrating catch-22 with "sustainable" fishing methods. Methods that are more careful about bycatch in generally lead to less fish per gallon of diesel, which is the primary driver of CO2 emissions for fisheries.
It is confusing to me that MSC is fine with being the forcing function to double carbon emissions - which is expected to have large effects on ocean habitats - while ostensibly being interested in ocean habitat.
I guess the complexity is that.. there doesn't seem to be a good answer, currently.
MSC certified line-caught fish will on average have double the CO2 emissions of seine caught fish, see: http://awsassets.panda.org/downloads/estimating_the_carbon_f...
It is confusing to me that MSC is fine with being the forcing function to double carbon emissions - which is expected to have large effects on ocean habitats - while ostensibly being interested in ocean habitat.
I guess the complexity is that.. there doesn't seem to be a good answer, currently.