As world leaders criticise the United States for pulling out of the Paris climate agreement, scientists are trying to work out exactly what a warmer world will mean.
It has been three months since famine, which has been caused by a long-standing conflict between the government and rebels groups, was declared in some parts of South Sudan.
The number of Kenyans needing emergency food aid has doubled in the past three months to three million, the Red Cross said on Tuesday, as the effect of a devastating drought worsens.