Craig Welch

Everything in nature—flowering, breeding, migration—lives and dies by a clock that is being recalibrated by climate change. We don’t yet know how severe the consequences may be.

We’ve added a billion people in just 12 years. The implications for the planet—and our own welfare—hinge on how we tackle climate change.

The Inflation Reduction Act is expected to cut roughly a billion tons of greenhouse gas emissions a year by 2030, save thousands of lives a year, and prompt a transformation of the U.S. energy and transportation landscape.

So you want to contribute to a mass tree planting campaign to combat climate change. Where can your money do the most good?

Pando, a huge aspen grove in Utah, is a single organism that’s lived for millennia. Unchecked grazing is destroying it.

Billions of dollars hinge on forests soaking up CO2 for decades to come. What happens when drought and fire kill the trees?

If not slowed, climate change over the next few centuries could lead to marine losses unlike anything Earth has seen in 252 million years, says a new study.

Ancient forests could get protection in the U.S. under a new directive aimed at helping these remarkable trees survive multiple threats.

Heat, drought, and bug infestations are killing trees worldwide. If we change course now, we can limit the damage.

During a visit to Yosemite, the president urges Americans to help protect parks for future generations and highlights his efforts on land, water preservation.

Temperature changes around the globe are pushing human pathogens of all kinds into unexpected new areas, raising many new risks for people.

Scientists have formally identified a new species of snailfish, the deepest ever caught in the Mariana Trench. A related species has been filmed but never collected.

While some conservationists are applauding the return of the bears, others worry that the species is not ready to be managed by states that may promote hunting.

A scientist restarts longest glacier study with sketched maps and bear mace. See how the landscape has changed in that time.

Scientists say a dead whale on a desolate beach and a skeleton hanging in a high school gym are a new species. Yet experts have never seen one alive.

The rate of rise in new cases is slowing in Washington, but officials stress they’re not out of the woods yet and social distancing remains in place.

Scientists have found yet another way human beings may be hurting killer whales: Infectious diseases spilling into marine waters from land are showing up in their breath.

A new study suggests warming sea temperatures could result in smaller fish sizes.

Colorful sea fans, fish, and gigantic sponges found in murky waters. One scientist says the reef has the most amazing animals she’s ever seen on an expedition.

So many juvenile great white sharks are biting—but not eating—sea otters that scientists say the phenomenon could slow the marine mammals’ recovery.