Answer:Fish.
In most cases the differences observed by the impacts of methane on the climate is called the greenhouse footprint.Beef and lamb, has higher green house effect than pork, chicken and vegetables.
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Beef and lamb systems emissions are dominated by methane.This is a short lived gas that has potent effects on global warming.Thus these animals have higher foot prints.
Besides, the destruction of plants population during grazing and rearing disrupts the CO2 cycle which may lead to the green house effect.
However, fishery does not need destruction of vegetation for farmland for rearing,and compare to above. Neither is methane released from the emission.They therefore have less less footprint.
Fish has lower green house effect,It is therefore the least
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