Some environmentalists worry that the burst of interest is temporary.

Some environmentalists worry about the presence of so many ships in Alaska.

Environmentalists worried about the development's effect on water quality.

But environmentalists worry that the arrangement will lead to similar exclusions to allow for more development.

Some environmentalists worry that the green lobby is putting too many of its eggs in the Democratic basket.

Environmentalists now worry it may be dying out due to over-fishing.

Environmentalists, however, worry that blocks made of ash will prove to be toxic in later years, when it is too late.

Environmentalists worry whether the new, larger ships pose a threat to the Caribbean islands.

And environmentalists worry about the effects on global warming from the two nations' plans to burn more fossil fuels.

Some environmentalists worry that this could erode safeguards for the popular sea creature.