Use 'boreal' to describe things associated with the northern part of Earth, especially near the Arctic. Migratory birds leave boreal regions before the onset of winter.
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Ecology focus
'Boreal' often refers to ecological systems or habitats in northern areas, such as forests. The conservation project aims to protect the boreal ecosystem.
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Not always cold
Despite being northern, 'boreal' doesn't necessarily mean the place is extremely cold; context matters. Summer in the boreal zone can be surprisingly mild.