Swapping bioplastics for regular plastics isn't necessarily an environmental win — and the reasons are complex.

The big cats have increased by 30 percent in India in just four years, but they still face pressures and controversies.

To meet ambitious climate goals, L.A. needs more local water. A critical step is battling the ghosts of industry past — polluted groundwater that dates back to World War II.

The IUCN just declared an African monkey known as Miss Waldron’s red colobus “possibly extinct.” Other species could be quick to follow, conservationists warn.

Poverty and hunger drive wild meat consumption in some regions of Madagascar, but wealthier citizens also drive illegal trade in lemurs. Will emerging solutions help?

Releasing captive-bred monarchs doesn’t benefit wild butterflies — in fact, it may make the problem worse.

New kinds of flood plans put nature back in charge, help populations adapt to a changing climate, reduce risk — and more.

The Australian icon could lose its fight against climate change, disease, habitat destruction and cars — but not if dedicated conservationists get the tools they need to protect the species.

Many of the gray whales found dead this year have suffered from malnutrition. Researchers are rushing to find the cause.

A range of new tactics aim to curb cigarette butt pollution, including groundbreaking legislation that could hold tobacco companies accountable for their products’ waste.