Faster fashion – online returns, social media hauls and pashmina in peril

The fashion industry has a lot to answer for — in 2018, it was responsible for 4% of the globe's total emissions. We delve into the world of fast fashion spurred on by social media and find out what happens to clothing you buy online and return. And in the Himalayas, we travel the historic Silk Road to learn what has become of the wool and textile industries that once sustained empires.