Can you give me a good idea of making a diorama about arctic climate?

Answer 1

open sea (and drowning polar bears), drunken trees (thawing permafrost)

Answer 2

I'd try to show the ice flows with the animals that live on them such as seals, polar bears,etc You could also show the whales--orkas, I think that are trying to eat the seals. I'm just doing this off the top of my head, so research the animals. You could even do half the diorama in bright sunlight and the other half in the dark. Hope this gets the ball rolling--aurora borealis would be awesome... Good Luck.