dr. barbero: thank you. good night. brent: now to china, where campaigners are hoping to secure the release of a photographer, famed for his work covering issues that china's government-controlling press prefers to avoid. lung had been missing for more than a month, but chinese authorities have now confirmed that he was arrested in the in the xinjiang region, where there has been a massive crackdown of the region's muslim population. stefanie: these photos show the tragic face of china, images that tell the recent history of the most populated country on earth and the high price it has paid for its rapid industrialization. decades-long environmental damage and the careless poisoning of its own people. ♪ lu guang is the man who captured these picturures. lu: : [speaking foreign languag] translator: if they make a mistake, i have to report on it. they tried to prevent me from filming. i have often been caught taking photos. i would use various tactics to get t away. stefanie: but in november, lu guang's luck ran out. he was traveling in the xinjiang province, where a vast number of muslims and other minorities are being held in reeducation camps, an area where press are not allowed. here, he was arrested. w