Kate Adie presents stories from China, Bolivia, the US and Italy.

BBC China correspondent Stephen McDonell arrived in Beijing as a student 20 years ago and jumped straight into the city's buzzing nightlife. But the bohemian club scene he fell in love with was rapidly replaced by shiny new shopping malls, and towering skyscrapers as China's wealth and ambition grew. Along with the economic boom came substantial military expansion and a tightening of control in political and cultural life under Xi Jinping's leadership. Stephen ponders if change is always for the better.

The southern US state of Louisiana is on the front-line of climate change. Its famous wetlands are now disappearing at a rate among the fastest in the world, and the state has lost nearly 2000 square miles of land over the past century leaving coastal communities increasingly vulnerable. Beth Timmins has met residents fearful for their future.

The invasive Paiche fish is so large and voracious it’s been called King of the River by fishermen in Bolivia. It’s thought that the breed escaped from fish farms in Peru and swam downstream, to take over the waterways of the Beni region in northern Bolivia. This mighty invader has changed the lives of locals as Jane Chambers learned.

And wild boars are on the rampage in Italy in rural areas - and now in cities too. Last year hunting laws were relaxed, to allow for the animals to be captured and killed in urban areas. This move was welcomed by Italy’s farming lobby – but has faced considerable criticism from city-dwelling conservationists. Nicholas Walton tells the story of how matters recently came to a head in his local village group-chat.

Series Producer: Serena Tarling