While man can survive for weeks without food, he can survive mere days without water. Despite this,...

Welcome to the Arctic: months of darkness, frigid temperatures, little food to be found or grown. D...

The rainforest is home to more species of plants and animals than any other habitat on the planet. F...

From lush cloud forests to bare summits, many people make their homes in the extreme altitudes of th...

Grasslands feed the world. Over thousands of years, humans have learned to grow grains on the grassl...

Rivers provide the essentials of life: fresh food and fresh water. They act as natural highways and...

A look at the man-made environment: the city. Over half of the world's population now lives in the ...