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End of the world was kind of a cold war thing. now with the political climate changing, so is the talk about survivalism. one man in texas cannot keep up with demand for his underground bunkers. tammy leitner has more. >> reporter: it looks like a backyard shed. >> here's the hidden door to the shelter. >> reporter: below the steel door, a secret underground bunker. we agreed not to disclose the location of this one. >> this is really something. >> reporter: a glimpse into a world most never see. >> how many people would this sleep? >> five on top. five here. so ten. this is actually an escape...

What to do with it. >> douglas did you want to get in on this? >> you go. >> exchanges between bernie sanders and scott pruitt. >> as i've indicated, climate is changing and even -- >> but haven't told me why you think it is. >> job of the administrator is carry out of the stch yuts from the body. >> why is climate changing. >> in response to the issue epa administrator is constrained by statutes. >> asking your personal opinion. >> it's immaterial to the job. >> you're going to be head of the agency to protect the environment and your personal feelings about whether climate change is caused b...

90% of the state has parched crops and dried up food supplies for livestock. >> is it a natural cycle? is it due to human interference or human conditions that we have created? that remains open to debate. but there is no doubt the climate is changing. >> president obama toured a fresno farm friday to it out federal support to address california's water crisis. in his state of the union speech, he was adamant. >> the debate is settled. climate change is a fact. >> the extreme weather is not limited to the united states. massive flooding has left large parts of england under water over the past...

Decade and led to a boom in tourism in ice caves off the water. in california, drought gripping 90% of the state has parched crops and dried up food supplies for livestock. >> is it a natural cycle? is it due to human interference or human conditions that we have created? that remains open to debate. but there is no doubt the climate is changing. >> president obama toured a fresno farm friday to it out federal support to address california's water crisis. in his state of the union speech, he was adamant. >> the debate is settled. climate change is a fact. >> the extreme weather is not limited ...

You know, my sense is that climate change and evolution are like gravity. they're a fact. drop a quarter, it falls. it's a fact. don't argue about it. it's not one of the many theories out there. it is a scientific reality. if somebody has some other standard besides science, i want to hear what it is, business practices, religion, tell me you have some other way of judging something besides the scientific method. as a scientist, is there any doubt that climate changing is a problem and it's caused by man? >> well, there are a few things in science that we're ascertain about as the fact that w...