Fjords release large amounts of methane. According to a recent Swedish study, methane emissions at the surface of the fjords are equivalent to those of all the deep oceans around the world. This phenomenon is linked to mixing of water layers from these bodies of water that flow into these dizzying U-shaped valleys. Often associated with cattle breeding or organic waste, methane is also hidden within one of the most impressive types of natural formations in the world: fjords. While Norway is home to some of the most breathtaking of such formations, they are also found in Sweden, Iceland, Greenl…