Also, a global deal to tackle shipping emissions has been agreed after nearly ten years of negotiations. The UN's maritime agency (the IMO) brokered the accord, which requires ship owners to use less carbon-intensive fuels or face a penalty. Roger Hearing speaks to IMO's secretary general, Arsenio Dominguez about how it would work.

And final campaign rallies are taking place in Gabon ahead of Saturday's presidential election. The transitional leader, Brice Oligui Nguema, is widely seen as the favourite.