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 ...

(Reuters) - During the Carboniferous Period, Earth's atmospheric oxygen levels surged, helping some plants and animals grow to gigantic proportions. One notable example was Arthropleura, the biggest ...

The new large millipede species was discovered in Colombia’s department of Boyacá, in the foothills of the Andes, about 1,600 feet above sea level, according to a study. Ricky Beron via Unsplash ...