the impact of climate change now let's bring in the author of one of the authors of this report john ferguson he is with the economist intelligence unit and joins us now from london john we're talking about the world economy 30 years from now how accurate can those predictions be. excellent it's a great question with any forecasts there is uncertainty in particular when you go out 3 decades and climate forecasting and the economic impact is also on certain that we have built a robust model with used a sort of dos model which is accident quite a quite a high profile model in the field and we've adapted it with our i and i climate change resilience index but as you say any forecast does have uncertainty but the thing to realize from our study is that 3 percent and some of those figures that you just spoke of if we were to miss the we've we've we believe the impact actually be higher than that we believe the risk that about the economy is higher than the nice because we just talked about it because of it because it has uncertainties john is it just about the damage that physically climate change

pleasure to be up here with sandy magnus and chris ferguson who flew the last shuttle flight, and one of my fondest mem memories i was just telling sandy, john young and i -- my commander and i got to do a photo op with them because we represented the bookends of the space shuttle program, if you will. i joined nasa right after apollo 11, 50 years ago, a long time, so i'm older than dirt, too. [ laughter ] >> i had come off a program that was highly classified department of defense program called the man orbiting laboratory, the mol for short. it was highly classified just a few years ago, it was finally declassified. our job was to take high resolution photographs of the soviet union. but when that program was canceled, they took seven of us crew members off of that and transferred us over to the nasa astronaut office. we didn't do any training, didn't go through a selection process with nasa. we just walked in the door. they put us to work. but there were some similarities between the sky lab program and what was being developed by nasa and the mol, so that was my first assignment was to go follow or bird dog what was going on with the dev