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Yvo de Boer resigns as top UN climate official
Yvo de Boer, the UN's top climate change official, says he will resign after nearly four years in the post.

His departure takes effect from 1 July, five months before 193 countries are due to reconvene in Mexico for another attempt at a global deal on climate.

Nations failed to reach a binding deal at the Copenhagen meeting in December. ...

...A different UN climate body - the Intergovernmental Panel on Climate Change (IPCC), which reviews climate science - has come under fire in recent months for a mistake on the melting of Himalayan glaciers and for referencing "grey literature" - a WWF report which had not been peer-reviewed.

The head of the IPCC, Dr Rajendra Pachauri, has rejected calls for his resignation.

In November, hundreds of e-mails from the Climatic Research Unit (CRU) at the University of East Anglia, UK, appeared on the web.

CRU maintains one of the world's most important datasets on how global temperatures have changed. ...