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c) With the Arctic the fastest-warming region on the planet, climate change is already altering key components of the Arctic environment.

a) Some of the clearest signs of change are the thinning and retreat of sea ice and the migration of species into the Arctic that normally live at lower latitudes.

d) The response of the Arctic to climate change will have an unprecedented impact on how the Arctic ecosystem operates.

b) This is likely to affect the UK's climate and economy, with anticipated impacts on industries like tourism and fisheries.