Earth Matters

Why good Christmas trees will be hard to find

8 surprising facts about Neanderthals

The world is running out of sand

'Breathtakingly audacious' project aims to plant 73 million trees in Amazon

What to see in the night sky in November

5 things to know about Australia's mystical Uluru

How did giant boulders get placed atop this island in the Bahamas?

Haunting time-lapse reveals how much of the night sky we're missing

On this planet, it snows sunscreen

Newport Beach enlists plastic coyotes to scare off sea lions

18 giggle-inducing animal photobombs

Carbon dioxide levels are reaching heights we haven't seen in 800,000 years