Kate Adie presents stories from Cambodia, Colombia, India, Fiji and Kenya.

The Mekong river provides a living for tens of millions of people who live along its banks across five East and South East Asian countries. However, new hydroelectric dams have upended communities which have lived along the river for millennia, with some Cambodian villages flooded to make way for new dam projects. Laura Bicker takes a journey to the heart of the Mekong river system to meet people recently displaced.

Four people have been arrested in Colombia in connection with the kidnapping of the father of the Liverpool footballer, Luis Diaz, who was released after two weeks of being held captive. The suspects are said to belong to a gang called Los Primos, with ties to the leftist rebel group, the National Liberation Army or ELN. Will Grant – an ardent Liverpool fan – was in Colombia as the situation unfolded.

Delhi’s air pollution is a year-round, chronic problem, but the city’s toxic smog becomes especially dangerous each winter. This year is no exception and the levels of pollutants in the air have been measuring close to ten times the acceptable limit in recent weeks. Geeta Pandey reports on how her fellow Delhiites are coping.

Kava is a psychoactive drink made from the bitter kava plant, and has been enjoyed in by Pacific Islanders for centuries - but in recent years there’s been rising international demand for the drink. Mark Stratton travelled to Fiji to see how this is affecting communities there, and to try kava for himself.

On Monday, Kenyans were given a special holiday to plant trees as part of the government’s ambitious goal to plant 15 billion new trees over the next ten years. Although the national tree planting initiative has proved popular, some have criticised the government for its recent decision to lift a ban on logging, reports Anne Soy.

Producer: Viv Jones