Back in March, roughly 80 people in Hong Kong marched in opposition to a land reclamation project that protesters say would increase pollution. Police were watching closely. Demonstrators had to wear numbered badges around their necks as they walked in the rain. It was a different image from the hundreds who protested in 2019. Back then, the people of Hong Kong showed up in unprecedented numbers. They were opposing what they saw as mainland China's latest efforts to impose authoritarian restrictions to chip away at Hong Kong autonomy.NPR's Ailsa Chang speaks with Louisa Lim, author of Indelible City: Dispossession And Defiance In Hong Kong. They discuss the long history of friction between Hong Kong and China, and the state of freedom of expression in Hong Kong today.In participating regions, you'll also hear a local news segment to help you make sense of what's going on in your community.Email us at considerthis@npr.org.