You won't need any reminder that it's summer in the national park. The heat wave that's settled over the Southwest has already brought 120-degree readings, which will likely be surpassed this week.

American Airlines has canceled 38 flights in and out of Phoenix on Tuesday afternoon because of extreme heat.

Because this extreme heat will last for several more days, the floodwaters aren't going away anytime soon. The higher the truck, the better for residents evacuating flooded homes in the River Bend RV Park.

Summer rain affecting subsistence food preservation.

Black bears typically stay near the treeline — but what was this guy doing so far up North, away from it?

The town of Nuugaatsiaq on Greenland's west coast was hit by a tsunami on Sunday devastating the town and the people living there. The people were evacuated by helicopters.

For the first time in 25 years, the Kluane Chilkat International Bike Relay has been cancelled - unexpectedly due to snow, 'black ice and slushy sections.'

The tent caterpillar may be chewing its way through swathes of forest foliage, but there's no danger of harm to trees, says expert.

Thanks to warming winters and thawing permafrost, Arctic soil microbes are churning out carbon dioxide well after the end of the growing season ends. This extra source of atmospheric carbon may accelerate a regional warming trend that is already twice as fast as the global average.

The 400-pound young boar attacked the 6-month-old puppy Wednesday morning, according to troopers and state biologists.

The fall of a climber into a crevasse highlighted this season's risky combination of crumbling snow bridges and splintered climbing teams.

When conditions are right, phytoplankton populations can grow explosively. And the ones blooming in the Black Sea right now are reflective, turning the usually dark water bright and milky.

Squid are occasionally found in the area, but not very often.

Tropical, tube-shaped animals called pyrosomes, known as "fire bodies,"; appear by the millions off the Pacific Northwest and Alaska. No one knows why.

It appears ticks have made their way to Yellowknife - one of the blood-thirsty bugs was plucked off a dog over the weekend.

Without action, the supply of fresh water in Iqaluit will begin to dwindle by 2024 due to climate change and increased demand, new research has found.

A team of scientists had to abandon an expedition from Quebec City to Churchill, Man., on Sunday because of hazardous ice conditions caused by climate change.

Bird observed well beyond its typical range.