Subsidence, sedimentation, sea-level change and human manipulation constantly alter the Mississippi Delta. And now, the beloved delta may be irrevocably shrinking.

Since hurricanes Katrina and Rita devastated the Mississippi Deltain 2005, there has been a lot of talk about coastal restoration and protection. But to find a sustainable solution to the delta's challenges — and all of our environmental challenges — we must consider how decisions about energy, climate change and economics will continue to affect the natural system.

On the 150th anniversary of the publication of Charles Darwin's groundbreaking work on natural selection, author David Williams tells of a personal encounter with a first edition of the book. 

In a landmark ruling, a district court found the Army Corps of Engineers liable for much of the flooding in New Orleans following Hurricane Katrina.

When winter weather strikes, most states spread sodium chloride, or road salt, to clear roadways of ice and snow. But road salt can have lasting environmental repercussions — so if not salt, then what? 

Whether dinosaurs were warm-blooded or cold-blooded has been a long-standing question, but new research on the biomechanics of two-legged dinosaurs adds more weight to the case for warm-bloodedness.

Sequestering carbon dioxide in underground aquifers may be one way to remove it from the atmosphere. But, once stored underground, will the greenhouse gas stay put? Evidence suggests that the gas mainly dissolves in the water, not the rock — but that should still keep it secure.

Every fall, the North American landscape transforms from a rolling verdure to a collage of vibrant yellows, oranges and reds. The autumn foliage in Europe, however, is comparatively monochrome, with mostly yellow leaves. One possible explanation for this difference may be the different evolutionary impact of insect predators on each continent.

Paleontological finds provide evidence both for and against dinosaurian ancestry — and many evolutionary puzzles remain: How did hands become wings? Did any dinosaurs have feathers? How did birds’ unusual, highly flight-specific respiratory systems evolve? Each new dinosaur discovery seems to muddy the picture further.

Knuckle-walking, common to many modern African apes, evolved more than once in the ape lineage, a new study finds — suggesting humans may never have had a knuckle-walking ancestor.

In the middle of the northern Pacific Ocean, a giant floating mess of plastic debris called the Great Pacific Garbage Patch is drifting and bobbing among the waves. In August, about 30 marine scientists set sail to get a closer look at the debris and determine what kind of impact it is having on ocean life.

With more and more people moving out of the country and into cities each year, megacity air pollution is an emerging environmental and health problem, said scientists at the American Chemical Society's annual meeting Tuesday.