TheTaiga forest, on the edge of the Arctic, is a silent world of stuntedconifers. The trees may be small but filming from the air reveals itstrue scale. A third of all trees on Earth grow here and during theshort summer they produce enough oxygen to change the atmosphere.
InCalifornia General Sherman, a giant sequoia, is the largest livingthing on the planet, ten times the size of a blue whale. The oldestorganisms alive are bristlecone pines. At more than 4,000 years oldthey pre-date the pyramids. But the baobab forests of Madagascar areperhaps the strangest of all.