In Brazil town turning to desert, farmers fight to hang on

Standing amid a terrain of rugged red craters that looks like something from Mars, Brazilian farmer Ubiratan Lemos Abade extends his arms, pointing to two possible futures for this land fast turning to desert.

Alien invasive species in Australia

Since the break-up of Gondwana, Australia's biodiversity has evolved mostly in isolation from the rest of the world. Many of our species are unique to Australia.

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