rafting the colorado is a breath-taking experience, it s a slow and sometimes bumpy ride through ancient time at a moment when it seems like the earth s clock is speeding up. even here the effect of climate change, rapid growth and water overconsumption are threatening the very existence of this river. we boat through cataract canyon, it s the best roller coaster in north america. class 5 rapids all the way down when it s high water and yet my most dangerous part of my job is when i get to this ramp. it s extremely dangerous. reporter: the river has shrunk so much that it s nearly impossible for colorado river guides like this man to pull boats out of the you have guides putting roller tubes underneath boats. as that boat is pulled up, guides are running and putting tubes under until we get to flat land on top like ancient
but what s going to prevent terrorists from buying and using them? i m wolf blitzer. you re in the situation room. captions by vitac www.vitac.com he entered the race at the top of the polls, but rick perry has been watching his numbers slide and slide. his momentum rather slow. now, with a closely watched speech, the texas governor is trying to reverse his declining campaign fortunes. jim acosta is joining us now. he delivered what his campaign described as a major speech today. that s right. the speech was called the energizing american jobs and security speech, wolf, but it was also designed to energize his campaign. looking to jump-start a campaign that s been stalled for weeks, rick perry laid out a texas-sized energy plan that the governor claims will create more than a million jobs. america s the saudi arabia of code. if elected president, perry says he ll push for new coal mining, oil exploration. perry would even expand production to the gulf of mexico