narrator: on this episode of "earth focus," climate change is forcing people to migrate in search of food and shelter, altering traditional lifestyles across the gln tijuana, mexico, haitians fleeing devastation are building a neighborhood as their eams of entering the united states dwindle. while in mongolia, the traditional herding lifestyle is threatened as drought forces a new generation to the capital in search of opportunities.

ke [mon derilus speaking spanish]

[greetings exchanged in spanish] [man on podium speaking spanish] [man speaki spanish]

[both speaking spanish]

[deriluspeaking] isabel rivera-collazo: we think of migrants and refugees as these people that are coming to take over our country. we don't ope that these are the pe that got to the point that it was so hard for them to survive that it was easier to face deh than to stay. because that'st whey are facing when they decide to get on a boat or they decide to cross a border or they decide to cross the , they're facing their own death, they're facing the death of their loved ones, their children, and that is a better decision thanng behind.

reporter: look at the size of this storm on satellite at this hour. tonight a direct hit in haiti slamminre at 145 miles per hour. [indistinct voices]

[derilus speaking] [whistle bowing]

[cesar palencia chavez speaking spanish]

[pasr gustavo banda speaking spanish] rotester: apology.

[indistinct crowd voices] protestanting: apology!ogy! [derilus speaking]

havez speaking]

[man speang]

rivera-collazo:omething said of climate migrants and environmental migrants is that often there is no populationo go back to. the same thing happens with wars. so, those that migrate, they have a very tough time to be able to continue their way of life, especially if they are left alone within a city or a place that they don't know and there are no other people from their own country.

narrator: tijuana is adapting to an influx of haitian immigrants who are testing the city's ability to support them. in ula the capital of mongolia, more than 600,000 nomadic herders have moved to the ceaving a deeply- rooted lifestyle now threatened imate change. [men speaking indistinctly] mitsuaki toyoda: people in mongole been practicing herding for centuries since the era of genghis khan. en today, out one-quarter of the population live a nomadic life.

[lamb bleating] toyoda: a dzud is a climatic term used in ia, which is characterized by summer drought followed by severe winter weather. the dzuused to happen every 10 years or so, but it's becoming more frequent.

[lamb bleating] [cd chattering]

toy0a: there is about 750,

people living in the care districts where infrastructure is very limited.

toyoda: the young people in mongolia is no different from any other young people living in other countries. they are very life can offer to them.

toyoda: we need be er long-term strategies to make sure that the livestock stor will become more sustainable. so it's probably better that we focus our assistance toward marginarders, especially to try to protect their livestock so that they can maintain their traditional nomadic way of life.

cu announcer: "earth is made possible in part by....

(rousing music) [narrator] the shallow, gin-clear waters of the bahamas are a tropical paradise, a favorite spot for sport fisherman and scuba divers alike. these waters are also one of the few areas in the world where humans can regularly spend time with dolphins underwar. [researcher] this is where we get the information abo what the life of the wild dolphin is really about. [narrator] the wild dolphin roject's research directo heand founder, dr. denise ing, has dedicated her career to immersing herself in the dolphin's world. e] [denisn the wild we deal with all sorts of challenges. number one is weather. if we can't get to where th live, we can't see them number two is finding them, 'cause they might move 20, 30 miles in a day, and it's a big ocean.