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See how the towering rainforests of the Amazon rely on the equatorial sun and rains - fuelling an environment that is like nowhere else.
The Equator is not only the line that divides the Earth, it is also the evolutionary powerhouse of the world. See its effect on the Galapagos.
The rainforests of South East Asia are a battleground, where the globe's greatest diversity of species fight for light, food and life.