dr. leabres. fine, answers the patient. lonely? no, i'm happy, he says.'ve learned my lesson and i will change my life. his spell in rehab might have been rough, but it probably saved his life. out on the streets, the killing continues, overseen by the president himself. host: what can be done to help drug addicts? series. this is when we meet people dedicated to conserving our natural world. this week we're in the serengeti national park in northeast tanzania. a population explosion has gone hand in hand with growing demand for grazing land for livestock. the trouble is, wildlife needs it, too. our reporter inga sieg and cameraman axel warnstedt went to the serengeti to see how the park and the region around it are faring. reporter: these lions don't need to worry where their next meal will come from. millions of wildebeest, zebras and antelope traverse the serengeti national park every year in the largest mammal migration in the world. but the park is in danger. conservationists rian and lorna labuschagne have been working in national parks for over 30

dr. leabres are charged 80 euros when they begin, and then 60 euros a month. those who can't afford the fees are given subsidies. dr. leabres: our challenge is to help people understand that an addict has a medical condition. he can be a frie, he c be a relative, he can be your son, or your husband or wife -- and all of this is part of you. help them. reporter: but not everyone is heeding this message. elected president in 2016, rodrigo duterte is waging war on drugs. 8000 spected drug pushers and users have been kied, many at the hands of the police or so-calledeath squads. more than a million have voluntarily turned themselves in and gone to prison in a bid to survive. the prisons are filled to bursting. and for these people, going cold turkey is a matter of life or death. others volunteer to go into >> the killings aren't right. since duterte has been in power, i've been afraid for my life. it's safer here. i also need to think about m wife's suffering. my child and my wife are really the worst affected. reporter: treatment is supposed to entail training, o