what happens to thwa ites at that! oh! yeah! thwaites affects us all because as it melts it will driver sea level around the world. this is part of the system. if it all goes you could end up with upwards of three metres of sea level rise. but first, the scientist need to get there. it's so difficult to operate here! all of the planes are grounded. they say they won't fly anywhere. one only does anything in antarctica with the cooperation of the weather. antarctica is a place of extremes. it is the coldest, highest, driest and windiest continent of the earth. capped by an ice sheet of up to five kilometres thick, this continent contains 90% of the world's ice. i begin my journey contains 90% of the world's ice. i begin myjourney in new zealand. passport? they say travelling to antarctica is like travelling to another planet. so, here it goes. the us air force provides the planes. the safety briefing may be familiar, but nothing else about this light is. —— flight. i'm travelling with professor david vaughan, the director of scie

we have never seen joe biden by thwa eight debates so far. perhaps tonight is the night. because yeah, i mean the campaign wouldn't agree with this characterization perhaps but joe biden is finding himself with his back against the wall. he needs to do something on the stage tonight to reverse this slide we have seen in the polls to show some strength after two weak showings in the iowa caucuses and they feel like they have a good chance of coming in at least second. but two big frustrations in the biden campaign heading into tonight's debate and something that they hope the vice president will do about it on the that stage. the first has to do with mayor bloomberg. with millions of dollars in ad spending he has turned himself into president obama's running mate. there was one former obama official that people are asking him if bloomberg had endorsed mayor bloomberg when he had not done so yet, so he wants to raise the fact that the fact that bloomberg was a critic over the iran deal and had been a critic of his leadership style while president obama was in the white hous

and only one candidate for idpresent thwa and he's still fighting for us, pledging to make clean aireryone, regardless of your zip code. that's the truth. that's tom steyer. i'm tom steyer and i approve this message. is thursday, february 27th, 2020. welcome back to "cbs this morning." i'm gayle king. ahead a new coronavirus case in california raises fresh concerns because no one knows where this one came from. >> i'm tony dokoupil. we hear from african-american voters in south carolina ahead of the democratic primary and why some are backing president trump. >> i'm anthony mason. meet a blind man helping others like him to try rock climbing in our series pushing the limits. >> first, here is today's eye opener at 8:00. >>> new concerns about the coronavirus. we now have the first case with no immediate links to travel or a related illness. >> we don't know how this person got infected. that is a big concern right now for health officials. last night in onl hisd ever white house briefing appearance the president tried to reassure nervous americans. >> we are very, very ready for this