Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

Anyone who has cleaned a beach can rattle off the head-shaking trash they’ve encountered, from cigarette butts to dirty diapers. But what volunteers sweeping Monmouth Beach found one July day in 2017 ...

And, well, they were slow and easily shot down, by air or by ground forces.

It makes sense that a balloon filled with a lightweight gas such as helium would float when surrounded by heavier air. But why does filling a huge balloon with hot air also make it float? This ...

(CNN) — At the end of July, Colorado became the latest US state to battle the spread of wildfires. Four blazes broke out, and while most are now contained, sustained hot, dry conditions this summer ...