The study of the timing of recurring natural events such as bud opening, egg laying or the arrival of a migratory animal. Many living organisms have defined life cycle events that take place at certain times of the year. PhenologyThe study of the timing of recurring natural events such as bud opening, egg laying or the arrival of a migratory animal. Many living organisms have defined life cycle events... More is of interest because it is thought that climateThe average weather we would expect over a long period of time (seasons, years, decades). Climate varies from place-to-place across the Earth. Climate is determined by long-term (over at least... More change is  affecting the timing of some events. In the ArcticDefinitions of the Arctic vary according to environmental, geographical, political, cultural and scientific perspectives. Some scientists define the Arctic as areas having a high latitude, long winters, short, cool summers,... More, the livelihoods of many people are dependent on natural events, such as the migration of reindeer or the arrival of marine animals that they hunt.

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