nessim says egyptian president adbdul fatah al-sisi should come to the aid of ordinary citizens to protect them from the police. >> i hope president al-sisi is keeping an eye on the police. they're worse than during mubarak's time. they're meaner and tougher. they have no respect for people or human rights. they just do whatever they want to. >> we asked the interior ministry to respond to these accusations, but our requests went unanswered. host: and now for our "global ideas" series, where we report on people working to protect biodiversity. today, our focus is on the mangrove forests, sensitive ecosystems found on many coastal areas around the world. but they also grow near cities like mumbai in india. our reporter sonia phalnikar paid a visit to thane creek. she wanted to find out what the rapidly expanding megacity is doing to protect its mangroves. >> the megacity of mumbai. more than 20 million people live and work in this coastal city. space is at a premium. more than half the residents live in slums and shanty towns. but this, too, is mumbai. an incredible natural spectacle -- eve