New Navy estimates showing many more dolphins, whales and other marine mammals could be hurt by sonar off Hawaii and Southern California caused alarm among environmentalists on Friday.
Some corporate giants are caught in the middle of a battle between a think tank skeptical of manmade global warming and an environmental group that it is trying to undermine its financial health.
A three-pawed grizzly bear affectionately known as "Tripawed" is back in public view at Alaska's Denali National Park, after it was first spotted last year with a bloody stump where its right front foot had been.
A plastic card dropped into the ocean 33 years ago has been found on the coast of Alaska, after a potential 88,000-mile journey.
Is a widely used pesticide to blame for making bees disappear? Three videos from NBC's "Nightly News" take a look at both sides of the neonicotinoid debate.
