查找三个在线来源，讨论气候变化对北极动物的影响。
1. https://woodwellclimate.org/climate-impacts/arctic-wildlife/
2. https://www.nationalgeographic.com/animals/2018/05/arctic-species-climate-change-global-warming-news/
3. https://wwf.panda.org/our_work/wildlife/arcticwildlife/climate_change/