Maybe you already knew the series from the BBC “Planet Earth”. If you dont, I envy you. You have still the possibility to discover for the first time the BEST natural story never told…and for free. Even if I recommend you to buy the DVDs, you will have access to the whole series for free in the following link:
Start taking a look at the “from pole to pole” chapter…After that, you will never see the planet in the same way.
Enjoy…and think about it.