around that time, scientists learned something extraordinary. whales were communicating with each other. sometimes by song over long distances. in part, because of that discovery, scientists and conservationists rallied to enact laws to protect the whales and it worked. the humpback whale population has made a remarkable comeback. now they face a host of new threats. global warming is killing off their food source and human activity is causing thousands of whale deaths a year from the stress of underwater construction noise to fishing entang amments and ship collisions. in the next hour, cnn s bill weir takes us to antarctica, a place very few get to visit to study these remarkable creatures and show us why saving the whales may also be saving the planet. because they are one of our best partners in battling climate change. reporter: those are the songs of humpback whales, flying about 15 billion miles away from earth, on the off chance intelligent life out there wants to
thousand people have gathered outside parliament in berlin. now on bbc news, the travel show. america s northwest is a place like no other. i m on a journey up through seattle and the last frontier alaska. previously, i explored seattle, in washington state, to find a city connected deeply to the natural world. and in alaska s capital, i saw how the prospect of gold still captures people s imaginations to this day. oh, look at that! chuckles you seeing it? we got some gold! chuckling continues how about that? how about, my friend? laughs what a way to experience alaska! so, this time, i m carrying on myjourney through alaska to see how people here continue to adapt to the natural world around them. you really have to plan your life and your day to day routines around what nature will allow you to do that day. ..even when it is changing at pace. all this area that s collapsed, this was completely full of water, about 14 billion gallons and it all rushed out underneath the
50 years ago humpback whales were considered an endangered species after decades of commercial whaling decimated the population. around that same time scientists learned something extraordinary. whales were communicating with each other, sometimes by song over long distances. in part because of that discovery scientists and conservationists rallied to enact laws to protect the whales, and it worked. the humpback whale population has made a remarkable comeback. but now they face a host of new threats. global warming is killing off their food source, and human activity is causing thousands of whale deaths a year. from the stress of underwater construction noise to fishing entanglements and ship collisions. in the next hour cnn s bill weir takes us to antarctica, a place very few people get to visit, to study these remarkable creatures and show us why saving the whales may also be saving the planet. because they are one of our best partners in battling climate change. reporter