UK aid agencies have launched a fundraising appeal to help millions of people facing hunger in East Africa.

• Twenty-one rhino horns worth an estimated $5m have been seized in Thailand after being found in luggage sent from Ethiopia in the biggest such haul in years.

The leader of the Taliban in Afghanistan, Hibatullah Akhundzada, has urged Afghans to plant more trees.

Rainstorms and landslides in Chile have contaminated a major river forcing the authorities to cut off drinking water to four million people in the capital, Santiago.

• Using wood pellets to generate low-carbon electricity is a flawed policy that is speeding up not slowing down climate warming.

• VW's top UK executive, Paul Willis, has said that of the 1.2 million cars in the UK affected by the diesel emissions scandal, 470,000 have been fixed.

A famine has been declared in parts of South Sudan, the first to be announced in any part of the world in six years.

• Scientists from the World Meteorological Organisation (WMO) say there is a possibility of a new El Niño event forming later this year.

Hundreds of homes have been evacuated in the New Zealand city of Christchurch as a huge wildfire rages on its outskirts.

Vitamin D supplements could spare more than three million people from colds or flu in the UK each year, researchers claim.