ruggiero: the problem begins very simply wiwith demand. narrator: and china drives the demand for ivory. knights: china now is estimated to be 70% of the world's ivory market. there is a tradition of ivory carving, but also, of course, the massive growth of the chinese economy. narrator: around 300 million people make up china's middle class today. that's more than the population of the united states, and they are looking to spend their money on luxury goods. ivory has particular appeal because of its long history in china. it has been carved there for more than 2,000 years, expressing many core chinese cultural and traditional values. knights: i think in some cases, people are speculating that ivory is almost like a currency that they can invevest in for the future. alie: you walk through beijing and in some of the stores you see ivory mantelpiece, exquisite carvings going for like 50,000 u.s. dollars, 60,000 u.s. dollars. knights: but i in addition to that, you hahave things like chopsticks, bangles that people wear, small carved items.

. >> and he starts banging on mike ruggiero's door. >> it was, "mike, mike, mike. this is david.n up the door." >> david's usually very quiet, so you knew that something was going on. >> i saw david temple with his 3-year-old son evan at the door. >> he just shoved him into my husband and said, call 911, someone's broken in the house. my husband turned around, shoved evan in my arms. >> here, you take evan. i'm going after david. >> david then takes off like a linebacker after a running back and barrels through the back gate. he runs upstairs and finds belinda. he immediately goes to the landline and calls 911. >> does she have a pulse? >> no, she's dead. oh. jesus christ. >> i responded along with another paramedic. there's certain calls you never forget. this is one of them. >> okay. i want you to do cpr for that baby. >> okay. >> okay? >> yes. >> reporter: with the injuries that belinda had, it was instant death. >> blood flow would have ceased almost at the same time as the shot was fired. or very shortly thereafter. once her blood flow ceased, the baby would very soon be rob