mankind. i don t think there is too much of people in this world. what we need to really think about is how to use wisely our resources. reporter: the u.n. said human population growth is the result of high fertility in many countries, as well as the advancement of technologies that benefit our longevity. the global population growth is gradually slowing. the u.n. projects that it would take 15 years to add one more billion people to the world and another 21 years for the next billion. more education, greater gender equality, more access to health care, all of these things will help to bring down the fertility rate and, therefore, slow the rate of growth. reporter: what won t be slowing is the impact of climate change on the next generation, as global leaders continue searching for a sustainable future, experts say that fewer
i don t think there is too much of people in this world. what we need to really think about is how to use wisely our resources. reporter: the u.n. said human population growth is the result of high fertility in many countries, as well as the advancement of technologies that benefit elongevity. but global population growth is gradually slowing, it would take 15 years for another billion, then 21 years for the next billion. more education, greater gender quality and more access to health care will help bring down the fertility rate and slow the rate of growth. reporter: what won t change is the impact of climate change on the next generation. as global leaders search for a sustainable future, fewer people
am i right? is that still one of the biggest threats to them? it s food we think now. biggest threats to them? it s food we think now. boat biggest threats to them? it s food we think now. boat impacts i biggest threats to them? it s food we think now. boat impacts havel biggest threats to them? it s food i we think now. boat impacts have been a major problem with manatees because they are very slow and get on the way of boats in florida. we have a major population growth associated with that, human population growth, and many more boats so the ability for the boats to impact manatees has increased but this problem we are seeing right now we think is due to the loss of food, the seagrass. if we have clear water, it s very suspicious that it s a chemical in the water. h water, it s very suspicious that it s a chemical in the water. i hope the sort it s a chemical in the water. i hope they sort that it s a chemical in the water. i hope they sort that out. it s a chemical in the w