Rising food prices could spread social unrest across Africa after triggering riots in Niger, Senegal, Cameroon and Burkina Faso, African ministers and senior agriculture diplomats have warned. Kanayo Nwanze, the vice-president of the United Nations' International Fund for Agriculture, told a conference in Ethiopia that food riots could become a common feature, particularly after the price of rice has doubled in three months. "The social unrest we have seen in places such as Burkina Faso, Senegal or Cameroon may become common in other places in Africa," Mr Nwanze said.

Poor countries at the U.N.

The United Nations conference on climate change, now on in Bangkok, is expected to produce an agreement to cut global emissions drastically by 2050.

It's not only our carbon footprint we should worry about.

Scientists and officials from across the world meet in Thailand this week for the first formal talks in the long process of drawing up a replacement for the Kyoto climate change pact by the end of 200

A meeting of United Nations member states in Bangkok on Monday to discuss climate change is the first in a series this year at which the action plan adopted at the UN Climate Change Conference in Bali, Indonesia, in December 2007, will be translated into concrete steps on the road to a new global climate change agreement. We, the president of Indonesia and the prime ministers of Poland and Denmark, have decided to join forces in a coordination group at the highest political level. Our goal is to facilitate an ambitious climate change agreement in Copenhagen in 2009.

As UN efforts to save the forests grind on, a range of alternatives is on offer

Food scientists are meeting in Cusco, Peru, this week to find ways of boosting world potato production to ease the strain of surging cereal prices on the world's poorest countries. Potato production already reached a record high last year as cereal prices rose, partly as a consequence of grain producers - such as the US - switching to bio-fuel crops. The impact of more expensive cereals has been harshest on developing countries that are dependent on imports.

A child clings to its mother's beads in this file picture of a famine-hit Ethiopian village.