Drones are being used to replant degraded areas of forest in Brazil – how successful have they been so far?
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Brazil beat a joint bid by Belgium, Netherlands and Germany to become first South American nation to host the event.
Rescue brings rare good news to southern Brazil, devastated by worst flooding in 80 years that has killed more than 100.
Crews race to rescue survivors as floodwaters displace 160,000 people across southern state of Rio Grade do Sul.