Millions of people in up to five West African countries will face a food crisis in early 2012 if early warning systems are ignored, the United Nations and aid officials say.

The UN's Food and Agriculture Organisation (FAO), together with the World Food Programme (WFP) and British charity Oxfam, said this week that failed harvests and low food reserves in the Sahel, and particularly the countries of Chad, Mauritania, Burkina Faso and Mali, would affect up to 11 million people.

Dramatic and unprecedented plumes of methane – a greenhouse gas 20 times more potent than carbon dioxide – have been seen bubbling to the surface of the Arctic Ocean by scientists undertaking an extensive survey of the region.

The scale and volume of the methane release has astonished the head of the Russian research team who has been surveying the seabed of the East Siberian Arctic Shelf off northern Russia for nearly 20 years.

The proportion of the world’s population with access to improved drinking water sources grew by 10 percent over a period roughly covering the past two decades, according to a United Nations study released Tuesday.

The study was released by the United Nations Children’s Fund (UNICEF) and UN World Health Organization (WHO).

The study found that between 1990 and 2008, the proportion of the world’s population with access to improved drinking water sources increased from 77 per cent to 87 percent.

We are right on the equator, and Speke, Moebius, Elena, Savoia and Moore, the five great glaciers of the the Rwenzori, the Mountains of the Moon, glint in the bright Ugandan sun. Usually lost in the mists that cloak these peaks up to 5,100 metres high, the glaciers are the only major ones left of the 43 that were mapped and named in 1906. Then, the ice covered 7.5 square kilometres, now it is thought to cover less than one.