>>> FINALLY TONIGHT HERE, ABC NEWS AND OUR REPORTING ON CLIMATE. ROBIN ROBERTS TAKING US TO NEW ZEALAND FOR THE WONDER OF IT ALL, AND THE WARNING ABOUT WHAT'S CHANGING ALREADY. >> Reporter: TO GET AN UP-CLOSE LOOK AT NEW ZEALAND'S SPECTACULAR YET VANISHING GLACIERS -- SO THIS IS THE BIRD WE'RE GOING UP IN. >> CERTAINLY IS. >> Reporter: WE SUITED UP FOR A BIRDS-EYE VIEW TO WITNESS THE DANGEROUSLY THIN ICE, AN OUT OF THIS WORLD EXPERIENCE. HERE WE GO. SOAKING IN THE MAJESTIC MOUNTAINS. SO UNTOUCHED. JUST SO NATURAL. CRYSTAL BLUE LAKES. OH MY GOODNESS! AND BREATHTAKING WATERFALLS. WOW! OUR LARGER THAN LIFE TREK REVEALING THE IMPACT OF A CHANGING CLIMATE. GLACIER PILOT MICHAEL CLARKE. >> IT LOOKS LIKE A WATERFALL, BUT IT'S ICE FALLING OFF THE CLIFFS AND SMASHING. SO, YOU CAN SEE IT DISAPPEARING RIGHT BEFORE OUR EYES. >> Reporter: BEHIND THIS STUNNING LANDSCAPE LIE CRACKS AND CREVICES. THE ICE MELTING AT A RECORD RATE. >> I CAN TELL YOU I'VE WATCHED GLACIERS COMPLETELY DISAPPEAR THROUGHOUT MY CAREER. >> Reporter: OVER 6,000 FEET ABOVE SEA LEVEL, IT WAS TIME TO EXPERIENCE THE GLACIER'S CONDITIONS FIRST-HAND. WOW. >> WELCOME TO PARADISE. >> Reporter: THANK YOU, MICHAEL. ARE YOU KIDDING ME? NICE OFFICE YOU GOT HERE. >> IT'S A PRETTY GOOD OFFICE. >> Reporter: OH, MY GOSH. I AM ON A GLACIER. >> YOU ARE. AND IT'S QUITE SOFT, EVEN FOR THIS TIME OF THE MORNING. LOOK AT THAT. >> Reporter: YES. >> JUST A LITTLE BIT AFTER 9:00 A.M. AND IT'S WARM. >> Reporter: WHY IS IT IMPORTANT TO YOU THAT PEOPLE KNOW WHAT'S GOING ON HERE? >> WELL, THEY ARE DISAPPEARING QUICKLY. I BRING TOURISTS FROM ALL AROUND THE WORLD TO APPRECIATE AND LOOK AT THESE BEAUTIFUL GLACIERS, BUT ONCE THEY'RE GONE, OBVIOUSLY, WE WON'T BE ABLE TO DO THAT ANYMORE. >> Reporter: BRIGHT SUN, SOFT ICE, AND EXTRAORDINARY VIEWS ON TOP OF THE ICE. >> STUNNING. AND REALLY IMPORTANT. ROBIN FROM NEW ZEALAND AGAIN