NYTimes - Environment

Sunflower sea stars, a species of giant starfish, are critically endangered. Researchers tinkered with sperm in an aquarium lab to help them reproduce.

Three orphaned calves were found in Florida. Then they racked up the frequent flyer miles.

A green honeycreeper spotted on a farm in Colombia exhibits a rare biological phenomenon known as bilateral gynandromorphism.

Sheila Watson works for a foundation that focuses on safe and environmentally sound mobility, supporting projects targeting access, emissions and safety.

Gray whales are regularly found in the North Pacific, but sightings in the Atlantic, from which they had vanished by the 18th century, are extremely rare.

Recent heat waves in cities worldwide have the hallmarks of global warming, researchers said. And last month was the hottest February on record.

The rules, designed to inform investors of business risks from climate change, were rolled back amid opposition from the G.O.P., fossil fuel producers, farmers and others.

Republican attorneys general from 24 states said the crackdown on fine industrial particles would raise costs. The E.P.A. said it would save lives.

Archaeologists have revealed a major production site for one of history’s most luxurious, and smelliest, colorants.

A new study of sinking and rising land along American coasts offers a more specific understanding of potential flooding in 32 coastal cities.

Buildings made shaggy with vegetation or fragrant with wood are no longer novelties.

Over the weekend the spiny orbs buried cars and piled up against the sides of houses as an unusual storm swept the region with dust and snow. And tumbleweeds. They’re still digging out.

The last child of the pioneering ecologist Aldo Leopold, she also helped preserve her father’s legacy as a founder of the modern environmental movement.

The S.E.C. was the target of intense corporate lobbying and a backlash from Republicans.

Many of our imprints on nature will be preserved in the rocks, scientists say, even if this time isn’t yet recognized as a new geologic epoch.

In a first, a California man was charged with sneaking banned gases, used in outdated fridges and air-conditioners, into the United States.

New U.N. research shows that climate change disproportionately erodes income in households led by women in poorer countries. But there are ways to fix it.

In the space of a few weeks, judges in Idaho, Nevada and Montana have altered the landscape for conserving dwindling aquifers.

A government forecast suggests that there could be even more wildfires this season than during last year’s exceptional fire period.

Dominica, a remote Caribbean island, enchants with its waterfalls, hot springs and hummingbirds. But a new airport and more tourists could tame its wildness.