Were the hopeful headlines—"Serengeti Highway Canned: Victory for Animals!"—premature? Wildlife is still at risk, some experts say.
A steady trickle of water is bringing wildlife back to a few parts of the Colorado River Delta.
Many old hard-rock mines—not just the one in Colorado that tainted a river with orange metallic waste—have pollution problems.
Amphibians with "sick and twisted" deformities remain widespread in the U.S. West, and pollution may be making it worse, new research says.
The shale gas industry maintains that its safeguards protect drinking water and land. But there have been accidents, and mistrust has been sown as the industrial process has moved into rural communities.
The Panama Canal is being widened. That means bigger ships and more cargo for Gulf and East Coast ports-and more alien species too.
Well-managed courses offer better habitat than some farm and park ponds.
As California's drought endangers Chinook salmon, fisheries officials release 600,000 baby salmon into the Sacramento River, triple the usual number, in hopes that many return to spawn.
A judge's ruling in the 2010 Gulf oil spill could have widespread consequences.
The president also pledged to fight illegal fishing and seafood fraud.