0ne special guest here today is tse ching yuen, who is now in his late 80s.ng outside his family bakery for three generations before it was taken down. cardin has arranged for him and his son to come and see the sign all lit up one more time. it might surprise you to learn that around 70% of hong kong is green. for my final stop, i'm off to lantau, one of hong kong's 250—odd islands. it's almost twice the size of hong kong island and around 40km away. lantau is a distinct contrast to the hectic buzz and skyscrapers of downtown hong kong. it's not unusual to spot a cow wandering the streets of lantau, even though we are so close to the city. hello! hi, christa! hi. how are you? i'm good, how are you? i'm here to meet ho loy, a conservationist who's dedicated her life to taking care of another bovine creature — the water buffalo. we're going to have a long day. are you ready for it? i think so. i'm ready to get my hands dirty, help the buffalo. this is the eco farm i grow. we bring the community here to take class and learn from us what the ecosystem is about.