From drugs control, to indigenous people’s rights and counter-terrorism, the UN General Assembly’s Third Committee is officially known as the Social, Humanitarian and Cultural Affairs Committee, with the full array of complex issues and challenges to mull over that its title would imply. Here’s the latest in our series of explainers on how the ideas and pledges of world leaders each September, are turned into action by Member States in the weeks after they go home.

Indonesians are being warned to stay away from beaches along the Sunda Strait, between the islands of Sumatra and Java, following this weekend’s devastating tsunami in the area, which government and humanitarian agency reports indicate has claimed hundreds of lives, with the total likely to rise.

The UN Refugee Agency (UNHCR) launched a $2.7 billion appeal on behalf of South Sudanese refugees on Tuesday, to address Africa’s largest displacement crisis, where millions have been uprooted by years of brutal civil war.

The freshly agreed Yemen ceasefire deal covering the key Red Sea governorates of Hudaydah and Taiz has been welcomed by the World Food Programme (WFP), which on Friday expressed hope that it would improve access for humanitarians and, just as crucially, commercial shipping.