The multinational company that operates the Red Dog Mine in Northwest Alaska says that thawing permafrost linked to global warming has forced it to spend nearly $20 million to manage its water storage and discharge.

Restrictions on bag limits and season length will start July 1 for both the Western Arctic and Teshekpuk herds, whose numbers are dropping. Restrictions will affect both resident and nonresident hunters.

One of the largest caribou herds in Alaska is shrinking, prompting hunters and conservationists to consider recommending hunting restrictions.