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BBC News - Science & Environment

1. Two-fifths of plants at risk of extinction, says report
   We are failing to harness the many benefits plants can provide, say scientists.
2. Great Barrier Reef: Uncovering the secrets of Australia's deep waters
   Scientists explain how the biggest deep-sea study of two marine parks led to exciting discoveries.
3. Zimbabwe: Elephants die from 'bacterial disease'
   More than 30 elephants were found lying on their stomachs, according to wildlife officials.
4. Rio Tinto: Mining giant accused of poisoning rivers in Papua New Guinea
   More than 150 people in Bougainville have filed a complaint against the embattled Rio Tinto company.
5. Buried lakes of liquid water discovered on Mars
   The underground lakes were detected in the Red Planet's south polar region.