“Going local” has been a mantra for people who want to make environmentally responsible choices about what they eat. But where food’s from might matter the most when calculating its carbon footprint.

The migrations that make up the well-known salmon life cycle have long been described as one way at a time. Juvenile salmon hatch and swim down rivers to the ocean, where they grow and mature before ...

When wild Atlantic salmon breed with escaped farmed salmon, their descendants grow faster and mature at a younger age, undermining the ability of the species to survive and reproduce in its natural ...