dr. davidson: business as usual is not really an option.nomy is based upon having tourists wanting to come here and spend time here. they're not gonna come here if the estuaries are full of algae that smell rotten. so it's extremely important, and we're getting to a tipping point where we have to do something. and i think the same is true across the globe. dudley: we know that people are still gonna want to come to the cape and that growth is gonna continue, so what we're really interested in trying to do is appropriately manage that growth. we believe that we can still save the habitat and that it isn't beyond a point of no return, and that's what we're actively trying to do. narrator: by combining census data with physical data collected in field studies, scientists can increase the accuracy of their models and help planners and policy makers prepare for future growth. dr. riche: what i do, essentially, is give people the base to look into the future, because we make connections between people and all these things that have costs. we will

dr. shini somara and marita davidson.when i'm in the field doing my research, one of my big issues i'm working on is how to conserve our wildlife. i got to go down to the san diego zoo. sme they are prerving dozens of -- they are preserving dozens of different species. this zoo is frozen! so let's take a look. at the famous san diego zoo safari park, lies a zoo within a zoo, replaced by liquid nitrogen and cell cultures. this is san diego's frozen zoo. that's right, zoo. not the one you grew up visiting but one in which there are living cells from over a thousand expertise, preserved sd frozen, all to help protect future generations of animals currently facing extinction. what was the genesis for creating the frozen zoo? >> the possibility to save sells -- cells allowed us to undertake, each cell of an individual is capable of producing the entire individual. >> take me through the process of freezing cells. >> we get a biopsy, a small slice of that individual. fest >> we can take those cells and treat them so they can be