Only 3 percent of the water on our planet is fresh. Yet these precious waters are rich with surprise. All life on land is ultimately dependent upon fresh water. The mysterious tepuis of Venezuela - isolated

Immense rivers of moving ice, laden with rock, grind their way down the mountains, gouging out deep valleys. They're the most powerful erosive force on our planet. A moulin - a shaft in the ice opened

Human beings venture into the highest parts of our planet at their peril. Some might think that by climbing a great mountain they have somehow conquered it, but we can only be visitors here. This is a

Further north, they hold other dangers. Moving at 250 miles an hour, an avalanche destroys everything in its path. In the American Rockies a 100,000 avalanches devastate the slopes every winter. This huge

Human beings venture into the highest parts of our planet at their peril. Some might think that by climbing a great mountain they have somehow conquered it, but we can only be visitors here. This is a

The storm is now subsiding, but not all the elephants have been so lucky. One youngster has got lost. Thirsty and exhausted, it follows the tracks of its mother, but sadly in the wrong direction. At the

In Japan the arrival of the cherry blossom announces the beginning of spring. The sun's energy brings color to the landscape. The earth, as it makes its annual journey around the sun, spins on a tilted

Every year three million caribou migrate across the Arctic tundra. The immensity of the herd can only be properly appreciated from the air. Some herds travel over 2,000 miles a year in search of fresh

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A hundred years ago there were one and a half billion people on Earth. Now, over six billion crowd our fragile planet. But even so, there are still places barely touched by humanity. This series will take