Long life: Yellowstone's oldest grizzly bear was 34 and still killing with 3 remaining teeth

LONG LIFE: Grizzly Bear 168 went from 450 pounds as a 5-year-old to 170 pounds when he was euthanized last year. He had just a couple teeth but was still on the prowl, gumming calves to death. Rangers say he sired at least three litters and outlived every female in the park by four years.

Biden signs executive orders on COVID-19, immigration, rejoining Paris climate accord and WHO

In his first hours as president, President Joe Biden signed a series of executive actions that reversed his predecessor’s orders on immigration, climate change and handling of the coronavirus pandemic.

2020 becomes Earth’s second hottest year on record

2020 has officially been ranked as Earth’s second hottest year, according to scientists from the National Oceanic and Atmospheric Administration.

Hawaii's Kilauea Volcano continues to vent lava

The western half of the lava lake in a crater on Kilauea Volcano was about 650 feet deep Friday morning.

Are tall wind turbines eyesores? Some residents opposed to 675 foot tall windmills

Are taller wind turbines ugly? A company wants to build a 120 turbine wind farm in Illinois. Some neighbors say the 675 foot high turbines are too big.

Environmental dangers a growing concern in the Great Lakes
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Tim Folger, contributor for National Geographic, talks about several challenges Lake Michigan and the other Great Lakes are facing.

UN World Food Program warns 2021 could 'have famines of biblical proportions'

The head of the World Food Program warned that without billions of dollars “we are going to have famines of biblical proportions in 2021.”

Rescued hiker dies in emergency room, is revived after heart stops for 45 minutes

INCREDIBLE: "He died while he was in the ER, which gave us the unique opportunity to try and save his life by basically bypassing his heart and lungs, which is the most advanced form of artificial life support that we have in the world," the doctor said.

US formally exits Paris Agreement that aims to curb climate change

The United States formally left the Paris Agreement, a global pact forged five years ago to avert the threat of catastrophic climate change.

US Election Day outcome will determine course of worldwide climate change, experts say

More wildfires. More heatwaves. More hurricanes. More flooding. If the United States is led by President Trump for another four more years, climate scientists say the world might reach a tipping point from which it might never recover.

Study: 1 to 2 million tons of US plastic ends up in oceans, rivers or illegally dumped

A new study finds that well more than a million tons of plastic waste in the U.S. isn't going where it should, instead ending up in oceans and rivers and along roads.

Arctic Sea ice isn't freezing in October for 1st time on record

Arctic sea ice melt season typically lasts from March until September, before sea ice begins to freeze over again. But this year, the sea ice is not recovering as expected.