the wwf team wants to find out how it affects the animals. marcelo: we know very little about the effects of mercury on animal organisms. there are findings about the effects on people -- damage to organs and the central nervous system -- but we know next to nothing about its effects on wild animals. ultrasound and blood tests as well as tissue samples. we want to find out how the toxin functions. reporter: the increasing number of dams and hydroelectric plants are also a threat to the dolphins. marcelo: separation caused by the presence of power stations is the main problem. they pose a barrier to genetic exchange. a male and a female can't breed if they're kept apart by a dam. reporter: this time the team is determined to attach a gps transmitter to a dolphin. it can take hours to net one. and then they still often mange to escape. research into river dolphins in colombia and bolivia is also underway, with other countries to follow. the wwf hopes to build a database of dolphin health throughout all of amazonia. most of the animals here are

say climate change is to blame dermot o'gorman is the chief executive officer of the wildlife charity wwf virtually the last decade or two decades, virtually no males have been born from turtle nests. this is due to higher temperatures resulting in higher sand. and of course, the male—to—female sex ratio of turtles is determined by the temperature of the sand in which they are laid. this population is an important one for the great barrier reef but is also a globally important population of green turtles, and it's the first time we've been able to use science to show what is a really invisible impact of climate change. no males being born over a 20 year period. the coral bleaching we've had over the last couple of years has been very visible, we've lost nearly 50% of inshore reefs. but this is an invisible threat that really, science has been able to shine a light on. time for a look at the weather... we are looking with concern about what has been happening in alpine areas recently. if anyone is planning going skiing, pay attention to this forecast. we are seeing heavy snow in the alps o

here's more on this from the charity wwf australia.st decade or two decades, virtually no males have been born from turtle nests. this is due to higher temperatures resulting in higher sand, and of course the male to female sex ratio is determined by the temperature of the sand in which they are laid. this population is a very important population for the great barrier reef but is also globally important. it is the first time we've been able to use science to show what is a really invisible impact of climate change. no males being born over a 20 year period. the coral bleaching we've had over the last couple of yea rs have we've had over the last couple of years have been very visible, we've lost nearly 50% of inshore reefs. this is an invisible threat that science has been able to shine a lightand. science has been able to shine a light and. i'll see you tomorrow at the same time for more of the biggest global stories. over the weekend all the weather excitement was the other side of the atla ntic excitement was the other side of the

this up and they don't want their fingerprints on it and the mayor was not there yesterday he was at wwfn is is he doesn't want to be associated with this while also endorsing it. >> i got word he didn't know about it and was upset he was not involved. is it the right things them philadelphia had a crazy idea of providing clean sir inms the for ekt withing people with services. larry casner wept to the legal system and said here's the reason we need to do this. we had syringe service programs in philadelphia over 25 years because of leadership and now in 2018 it's time for new leadership, we had 30% increase between 20 15 this is what progressive nations are doing to address a problem killing far too many people. >> you know what's going to be said. aren't you encouraging drug use devin. >> not at all people are already using drugs and now using drugs in abandoned houses and in alleys and what's happening they're tying and there's nobody there to help them and everybody person that dies is a broken family and we he need to talk about that. >> if i'm hooked on heroin with if i cot cox and

when hulk hogan came into the wwf in 1983 or '84 -- i can't remember -- and this is when he was getting ball. i'm ging want you to go." hulkamania running wild, right? right there, like, right when he came in, he was wrestling in madison square garden. he had a white headband that said hulkster. do you remember that, dude? >> yeah, i remember seeing that. >> he came in the ring, and i was at madison square garden. i was sitting front row with my mom and i was watching the matches, and he came out and he was -- i'll never forget -- he was wrestling paul orndorff, mr. wonderful. he takes the thing off and he throws it to the crowd, and i caught it. and it was a big, like, nerd-out moment. >> really? >> we cry nerd tears. >> [ laughing ] yeah, we do. >> i was like... and i caught it. it was amazing, right? so, now, my dad was wrestling on the card that night, madison square garden. i was so happy that i caught this thing from hulk hogan. i go in the back of the dressing room when the matches were over, and i go to my dad, and i was like, "look, i caught hulk hogan's headband." he's like, "