BBC: Senior scientists and government officials are meeting in Japan to agree a critical report on the impacts of global warming.
Members of the Intergovernmental Panel on Climate Change (IPCC) will publish their first update on the scale of the threat in seven years.
Leaked documents speak of significant impacts on economies, food supplies and security.
But some attendees say the summary, due out next Monday, is far too alarmist.
This will be the second of a trilogy of reports on the causes,...