Eils Nevitt treks deep into the threatened Amazon rainforest while Holly Morris catches up with one of the remarkable nomadic Tuareg tribes of the Sahara Desert.

• 气候的转变使冰川溶解，到地球的两极，巴塔哥尼亚最壮观的冰川，泛舟近观，感受冰川倒下的震撼力，走进冰川中的山洞，细看大自然的鬼斧神工。