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the long term impact of climate change can be hard to grasp. gradual differences in the environment are not always easy to see. we were able to get a close look at how climate change is affecting one of the most remarkable animals in north america. lee cowen visited the self proclaimed polar bear capital of the world. >> reporter: on the edge of canada's arctic, along the western shore of hudson bay, it is easy to think you have reached the ends of the earth. in fact it can feel look you are utterly alone up here. but then out in all of that

eyes slowly open. revealing what we came all this way to see. and apparently, the world's largest land predator came to see us too. >> for me this is mind blowing. how rare is nice see here? >> well it is pretty common to see polar bears out here this time of year. but it's not as common to see a big old male like that. just come and lay down right next to the buggy. >> it is unreal. >> yeah, pretty impressive sight. >> reporter: the buggy is a tundra buggy -- sort of a cross between a tour bus and monitor struck. >> 20 minutes. >> reporter: where steve amstrip does much of his work as chief scientist for polar bears international. a private group campaigning for the bears' conservation. >> oh, look at here. he is getting up.

that? >> well, you know, i have, i have been working with polar bears for -- for 35 years now. and -- i still, every time i see them it's holy cow there is a real wild polar bear. they're just incredible creatures. >> we're near churchill, manitoba, remote frontier town that proudly calls itself the polar bear capital of the world. it is isolated to be sure. you can't even get to this town by road. but every fall these giants of the north come here in droves to wait for hudson bay to freeze back over. so they can start eating again. the polar bears' main source of food is seal meat. the easiest way for the bears to hunt them is from the ice above. as their line grows on land another migration rolls up to

>> freezing. >> reporter: a quiet stampede of eco tourists anxious to catch a glimpse of an animal whose future is as hotly debated as climate change itself. >> in the united states, we have listed polar bears as threatened species under the u.s. endangered species act. they were listed as threatened not necessarily because of their current status, but because of what we anticipate their future status to be. >> reporter: and what he anticipates their future status might be has him worried but he knows not everyone is wringing their hand. currently estimated between 20,000 to 25,000 polar bears in the wild. to many that is a pretty sizable number. some of the bears in the upper reaches of the arctic seem to be doing quite well. >> they lose a kilogram of body weight or two pound of body

>> reporter: what concerns him the most are the bears here who he says are experiencing the effects of climate change right now. >> these guys are on land now. a whole month longer than they were 30 years ago. >> we could say, one population might be doing well now. but we know that soon all of the populations will have less sea ice than they do now. some will have no sea ice. >> those who track sea ice levels, national snow and ice data center say seasonal ice in the southernmost region of the polar bear habitat is already melting earlier and freezing later. that means, bears are marooned on land longer and getting hungrier. how long has he gone without eating a full meal. >> they came ashore this year, i think, in about the middle of

he really hasn't had much to eat since then. >> reporter: in november when we were there, the bears were spending most of their time lounging about frying to conserve energy. which makes them pretty easy to find and photograph. let's face it nothing makes for a better photo op than a scratching, relaxing, polar bear. while they look as friendly as they are fuzzy. truth is they're one of nature's perfect killing machines. their enormous size and strength are part of the allure. so many people have told me now, this is their bucket list. kevin burke is one of churchill's few locales and takes joy in showing tour tiss their frozen backyard. >> a lot of activity. the bears are checking the ice. let's check it out. he drives one of the tundra buggies. and a company providing bundled

lifetime. >> whoa. >> oh, my gosh. >> going after the other one. the bears don't seem to mind the intrusion. in fact many are downright curious of the tundra buggies. on occasion, too curious. >> a lot of times through years. i watched the bears. they're -- they'll push back. they'll get on the ground. and look along like that. my opinion is, i don't think we smell all that appealing to them. >> we might not smell too appealing, but the food in town does. there are warning signs posted everywhere. reminding the residents to beep bear aware as they call it. we quickly found out why. >> they're getting way too close. yeah. this mom and her two cubs ndered right up behind us on a sy road just outside of town. mike. ke. >> she came within a few feet of our camera.

>> is it safe to walk around churchill? >> i would say it is safe to walk around churchill in the day. i wouldn't say so at night. >> reporter: a manitoba conservation officer. >> right over here you can see them walking away from us. yeah. his job -- to keep polar bears away from people. >> which is a good sign. >> good sign, yeah, we want that to happen. >> reporter: if it can't scare the nuisance bears away, well, they capture them. so back here is where we keep one of our traps. 50%, 60% of the bears. half the bears we capture this year have been at this trap. e way ward bears are brought re, what locals call, polar ar jail.

to come back to town again, the bears are given no food. just water. >> we don't want them to associate food to humans or to that building. we are going to hold them 30 days. 30 days closer to the time the ice is going to form on the bay when they're going to go out and hunt seals. also 30 days away from the problem behavior that it caused them to go there in the first place. when their sentence 'tis up, they're tranquilized and air lifted back out into the ton tundra. not lost on anyone here is the carbon footprint left behind by those who travel all this way to witness all things polar bear. >> all of the tourists that show up here does that help or hurt? >> i think that for many people

seeing how things are now and hearing how they used to be, and seeing a magnificent species of the polar bear right in front of them suddenly they can become inspired in a way that they might never have become inspired before. you know, i studied polar bears in alaska for -- for most of my adult life. and one of the last things i did was predict that they were going to disappear. it's a little hard for me to talk about. to think that may might be gone. i don't want to think about that. so i want to do what i can to stop it. i think we are. i think we are making progress. >> reporter: most agree progress was made at global climate change conference in paris. representatives of 195 nation as greed for very first time to

gasses. in the meantime, the polar bears here, and all around, the vast reaches of the arctic, will continue to do what they have always done. survive the best they can. in whatever conditions are thrown their way. i took mucinex dm for my phlegmy cough. yeah...but what about mike? he has that dry scratchy thing going on. guess what? it works on his cough too. cough! guess what? it works on his cough too. what? stop! don't pull me! spoiler alert! she doesn't make it! only mucinex dm relieves bothwet and dry coughs for 12 hours with two medicines in one pill. start the relief. ditch the misery. let's end this. check this out, bro. what's that, broheim? i switched to geico and got more. more savings on car insurance? yeah bro-fessor, and more. like renters insurance. more ways to save. nice, bro-tato chip. that's not all, bro-tein shake. geico has motorcycle and rv insurance, too. oh, that's a lot more.

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a little touch is all it takes. k-y touch. the country any most prestigious dog competition crowned a champion. a 3-year-old german short-haired pointer best in show at

show. the win was an upset because another dog was favored to take the top prize. don dahler breaks it down for us. >> reporter: one more time all the way around the german shepherd rumor. reporter: as all seven purebred finalists strutted beauty and poise, the judge made up his mind. >> best in show dog tonight. 2016 is the german short haired. >> the german short haired pointer. >> reporter: c.j. traveled from california with valerie nunez atkinson. >> a great short hair. a great one. definitely will go down in history and now. there were seven fabulous dogs out there. you couldn't go wrong any which way. >> reporter: the rough competition wasn't short on drama. >> the winner of the herding group -- german shepherd dog, 8. >> reporter: much of the spotlight had been on the crowd a 4-year-old german shepard before the finale, handler kent

top ranked show dog from losing her cool. >> really never dreamed we would have one that would be best in show. and go the way this one is. >> an amazing dog. >> kind of turned out beyond our wildest imagination. >> well done. >> one judge presides over best in show this year's king maker dr. richard maem. >> i was focusing on the expression on the face. expression of the breed is really important. each breed is unique has to have that expression. >> reporter: c.j.'s co-owner says at home he is just one of the pups. >> he is very serious. it is business. at home he is silly. he is a there mall dog. he gets dirty. he has fun. he always has the to have something in his mouth. always. that's the sporting dog.

be right back. the popularity of greyhound racing, the hound could be seeing their final finish line. david begnaud reports. >> reporter: taking his daughter and grandchildren to the naples fort myers greyhound racing track for 20 years. on this day the grandstands were nearly empty. >> i've have seen a big decline in the attendance. i remember the crowds really cheering. the u.s. 12 are in florida. izadore habnik owns two. thousands. december. >> reporter: he lose thes $5

he says he has to in order to keep his more profitable poker business open. florida law mandates it. >> we have to run 90% of the amount of racing we can in 1996 to keep our poker room open. >> how many races do you have to run ape year year? >> he supports decoupling the two businesses so he can run his poker rooms without racing the dogs. the executive director of gray 2 k, an organization working to protect greyhound. >> greyhound racing is cruel, inhumane. the dogs live in small cages for 22 hours a day. the cages are barely large enough for the degree to stand up or turn around. if they've don't want to run greyhound racing they could stop today. stop today. turn in your permit. >> reporter: he insists the dogs are well cared for and blames audience decline on track owners. >> why greyhound racing is alive and well if the tracks wanted to

to modernize it. the animal rights groups and greyhound tracks want slot casinos. >> reporter: it is buried in a gambling bill before the florida

it may be voted on. captioning funded by cbs it's thursday, february 18th, 2016. this is the "cbs morning news." the thaw in u.s. cuba relations about to take a step forward. president obama will visit the island nation in nearly 90 years for the first in the nation. the debate over privacy and security widens after a judge orders apple to hack into the iphone of one of the san bernardino shooters. learning the hard way. a texas man says u.s. marshals pounded on his door and arrested him, all to collect a student loan debt. and where is the cheese?

graded parmesan include high levels of additives, including one made from wood pulp. good morning from the studio 57 newsroom at cbs news headquarters in new york. good to be with you. i'm anne-marie green. later today, the white house will announce that president obama will make a historic visit to cuba. it will be part of a trip to latin america, mr. obama is making next month. the obama administration began normalizing the relations with the castro regime in 2014. this would be the first state visit by a u.s. president to the island nation since 1928. on the campaign trail, the news did not sit well with at least two republican presidential candidates, ted cruz and marco rubio who are both children of cuban immigrants who fled the castro regime.