The brittle star specimen suggests that the sea creatures have been splitting themselves in two to reproduce for more than 150 million years.

Scientists used tree rings to compare last year’s extreme heat with temperatures over the past two millenniums.

A growing number of researchers in the field are using their expertise to fight the climate crisis.

The Federal Energy Regulatory Commission approved the biggest changes in more than a decade to the way U.S. power lines are planned and funded.

Researchers had been testing a sprayer that could one day be used to push a salty mist skyward, cooling the Earth. Officials stopped the work, citing health questions.

Trained negotiators can help families struggling with vexing elder-care issues.