Energy/Environment

A new study indicates that the relatively low mass of Mars allowed most of its water to be lost to space billions of years ago, rather than retained on its surface.

Entergy failed to rebuild a stronger system after hurricanes repeatedly damaged its electric grid. Then Hurricane Ida knocked out power for more than a week in the middle of a heat wave.

Dr. Janet Woodcock, an administrative veteran of the Food and Drug Administration since the 1980s, has been acting director of the agency since January. Why is the permanent job so hard to fill?

The announcement provides needed momentum for global climate change negotiations in November, but coal power is expected to keep growing within China itself.

Scientists thought that humans with stone weapons may have caused the disappearance of Ice Age beasts like woolly mammoths. New research shows that stones were no match for mammoths' hair and hide.

The Occupational Safety and Health Administration announced it will push to protect workers against rising temperatures, including a federal rule to safeguard workers from heat-related illnesses.

The benefits of the change will be equivalent to more than 650,000 people not using any plastic for a year, the company said.

To slow the collapse of nature, the Biden administration is promising to protect nearly a third of the country's land and water by 2030. The plan is expected to rely heavily on private landowners.

Fungi, parasites, root rot: Climate change is increasing the risk of trees weakening and dying. Falling trees have increased power outages nationwide, which threaten public health and safety.

Intensive rehabilitative therapy that starts two to three months after a stroke may be key to helping the injured brain rewire, a new study suggests. That's later than covered by many insurance plans.