his sister dorcus sums up the findings of the police investigation. >> he tried to run back, but then probably there were others there, so he tried to run down the stairs and tried to hide behind the bushes, so they pulled him. >> she tells us there used to be fewer elephants in the area and they were less aggressive. >> in the past, they were just calm animals. you'd pass an elephant just feeding there, sometimes without even seeing it. but nowadays they actually charge, without even a person provoking them anyhow. >> she says the aggression may well mean the elephants are feeling stressed. the question remains -- if the elephant population continues to rise, and the human population grows as well, unhappy encounters will probably continue to occur, and a sustainable solution will still need to be found. >> in our "global ideas" series, we head to the pacific ocean. it's home to many species of sea turtle. our reporter clare richardson went tthe arnavon islands, part of the solomon islands. she met some activists who are working to protect the turtles. >> the solomon islands look lik