Kenyan conservationist Richard Leakey dies aged 77

Paleoanthropologist spearheaded campaigns against ivory trade in Africa

Scientists call for immediate action on UN climate change report

‘Earth has never felt smaller, its natural ecosystems never under such direct threat’

New ways to communicate on climate change but the message is still the same

Science writer Andrew Revkin is trying to chart new paths in which journalism can serve as a discussion zone for building a sustainable world

Ship to shore: $20m campaign to bring back 5,500 Titanic artefacts to Belfast launched

New initiative aims to safeguard collection which is in danger of being split up

Gulf of Mexico-style oil spill ‘could happen again’

For all his experience of environmental disasters, expert Terry Garcia is optimistic

Surface of what is believed to be Jesus’s tomb uncovered in Jerusalem

Tomb has been covered by marble cladding since at least 1555 but most likely for centuries before that

New bird species discovered in forests of Indonesia

Sulawesi streaked flycatcher eluded human engagement for 15 years after first sighting

Cave divers find one of oldest human skeletons in N America

DNA from bones of teenage girl 40m below sea level answers questions on colonisation

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