The major source of greenhouse gas emissions for lobsters come from the diesel combustion and production of the fishing ships [1]. There is a major difference in emissions between trawling (scraping the sea floor) and creeling (traps lowered to the sea floor), with creeling emitting about 10kg CO2e per kg of whole lobster, which is about 3 times as little as trawling with about 30kg CO2e[1]. Unfortunately, the latter is the most common form of lobster fishing at around 80%[1].

[1] Ziegler, F., & Valentinsson, D. (2008). Environmental life cycle assessment of Norway lobster (Nephrops norvegicus) caught along the Swedish west coast by creels and conventional trawls—LCA methodology with case study. The International Journal of Life Cycle Assessment, 13(6), 487-497.