This is bbc news, the headlines president s trump and xi are preparing for talks at the 620 sumit injapan. Summit injapan. The us and chinese leaders are meeting after trade negotiations stalled last month. Mr trump has threatened to impose new tariffs on chinese imports. Mr xi has warned this could destroy global trade. The European Union has agreed a huge free trade deal with south americas biggest commercial bloc, mercosur, after two decades of talks. The eus agreement with argentina, brazil, paraguay and uruguay creates a market for goods and Services Covering almost 800 million people. Lady gaga hasjoined crowds in new york, marking 50 years since the stonewall riots helped spark the fight for lgbt rights. The Stonewall Inn was a gay bar where regulars fought back against police harrassement giving birth to a Global Movement in support of equal rights. In a moment on bbc news, its newswatch. But first heres click. I want to share with you a fact that i hadnt fully understood until i met climate scientist ed hawkins last year. Now, id known that our weather was getting worse and our sea levels were rising, and id known that Global Warming was happening because we were emitting Carbon Dioxide and methane into the air at a runaway rate, but what i hadnt fully understood is this simply reducing Greenhouse Gas emissions will not bring Global Warming under control. For every ton of c02 that we put into the atmosphere the temperature goes up a little bit more. In order to stop Global Warming we need to do something very drastic indeed. If we end up in a world where our emissions are net zero, were not increasing the amount of Carbon Dioxide in the atmosphere any more, then that will stabilise Global Temperatures at the point at which we do that. But its not realistic. To reduce Global Temperatures we would need to somehow remove Carbon Dioxide from the atmosphere. Now, there are already ways of capturing c02 at source on its way out of power stations, for example. But this doesnt get it all, by any means. What you need is something to pull c02 back out of the air. What you need is Something Like this. Its called the artificial tree. The air passes through these filters, which are made of a very special material because the c02 actually clings to this material as the air passes over it. Now, once these filters are saturated with Carbon Dioxide this whole thing moves down into a container of water where this particular material releases the c02 into the steel container and then, congratulations, youve captured yourself some c02 from the air. This is the brainchild of klaus lackner, here at the aptly named negative Emissions Centre at Arizona State university. They realised very early on this was a Waste Management problem. We are dumping c02 into the atmosphere and it just stays there. So was very clear to me in the early 90s that sometime in the 21st century we will have to stop emitting. Klaus argues that since we are failing to meet our targets for co2 emissions, Carbon Capture from the air is now unavoidable. And now people are listening, as technology has recently received commercial investment. We have put so much c02 in the air that we actually have to come back. So we call ourselves the center for negative Carbon Emissions because we are thinking about having a period in this century in which we will have to take 100 ppm back. Now, that is more c02 than the world emitted in the 20th century. How many of these do you think we will need . A lot, a lot. Now, these are very small. But go to the size of a shipping container, if you wanted to actually match current emissions you would need 100 million of them. Right. Now, these are bigger than that. But 100 million sounds like a horribly large number until you start deconstructing it. We build 80 million cars. Shanghai harbour is sending out about 30 million full shipping containers every year. So i would argue that as far as industrial scale goes, this is large, but not outrageously large. And as people around the world started to reach the conclusion that Carbon Capture is needed, a start up scene is beginning to grow with differing approaches. Because c02 is everywhere, it doesnt really matter where you put your devices. And in iceland, caerix has something very useful green geothermal power. Using this, they claim to be able to capture way more carbon than klauss artificial trees. And once youve captured the carbon, the next problem is what youre going to do with it . There are so many r d projects under way trying to make use of the c02, so that its notjust rubbish, but we can actually make something valuable from it. We can use the c02 to create drinks, beers or soda or whatever. We can also use c02 forfuel production. There are also currently studies ongoing to see if we can somehow use the c02 as a building material. Yeah, in the future we may be able to lock c02 into concrete. Although the amount of rock wed create has been estimated to cover a landmass the size of egypt. And, in fact, to do this any other way also requires a scale that is pretty unimaginable. You could say we can do it with trees and real forests, and you can calculate if you wanted to do the same 100 million of these units in forests or any agriculture, any photosynthetic substance, you suddenly realise that the land area or the area you need is larger than current agriculture. You know, pastoral lands, fields, everything added, we would need more than that. This is quite a scene. The dancers here are being choreographed by Artificial Intelligence, which has learned from moves created by a leading choreographer and its quite something. Wayne mcgregor has been running his Dance Company for 25 years, so has an archive perfect for thejob. Wayne is actually here today, but he seems to be focusing on perfecting the moves rather than designing a whole dance. A computer algorithm is analysing hundreds of hours of his dance creations, sparking new personalised routines ready for a show in la next month. So how does he feel seeing what the technology musters up . You see it on the screen and its surprising, its something youve not seen before. You cant quite work out how your body can do that and then the dancers in the room have to translate it, they find, they have to look at it and find a way of it themselves embodying the physicality. The imagery used could improve over time, but there is also a reason for the imperfections. This has been the creation of the man behind google cardboard, who greatly values technology as a tool to enhance not reduce creativity. Of course the dancer, the choreographer is the artist and the ai is there to stimulate creativity and not to replace it. We display some stick figure just to display the whole output of the algorithm, but we are also making a rendering which is something in between abstraction and the skeleton. And if it was too perfect then it would look like a video and it would be less stimulating for the dancer to be inspired. And as well as the idea of immortalising talent and teaching, there seems to be some other added value. What its doing is supplementing, enhancing, dealing with data in a way that we couldnt deal with it, offering us opportunities that we would never be able to see. And so in a way it becomes like an 11th dancer in the studio with you, its a kind of a creative partner rather than one thats replacing your kind of creative gifts, if you like. The other thing is, its really important, its about the dialogue between machine and body, between the thinking body and the thinking machine. So was not ever that we set the system going and just learn the choreography, thats not interesting to us. These dancers make every move looks so graceful, so its hard to imagine a bad outcome being created here. But how do they feel about being taught by ai . Usually you have wayne come in and he either gives us creative tasks himself, which could be based on anything, it could be a poem, it could be audio inspiration from a track, but to have these really intelligent quick systems that kind of generate movement that then we have to learn from, an ai system, its very different. Whatever the google stick men are demonstrating, just take something from it. You know, we dont spend too long analysing. Its really find each other. Its just whatever you see, take something from it. At the moment it doesnt understand momentum and physics and gravity, so it makes us move our bodies in an incredibly different way. You know, we have a typical vocabulary, each and every one of us, that we kind of go into that we try to strive away from, and i think that this helps us do that. So while its early days for this technology and it doesnt seem to be making the real life choreographer redundant, maybe, just maybe, Artificial Intelligence could push creativity to a whole new level. That was dan, and that is it for click episode 999. I know we have been on air every week for over 19 years. And next week is our 1000th programme. To celebrate, when doing something very special. And youre all invited. For the first time, rather than us deciding what you watch, you will be in the driving seat. Because for our 1000th episode, the bbc is letting us pioneer a completely new way of making tv. We have created an interactive world of stories for you to explore however you wish. More than a year in the making, from the self driving capital of the world, phoenix, arizona, to magical malawi to meet the inventors using ai and ancient technology to solve everyday problems. Combining the production techniques of videogames with that click storytelling that you know and love, you will be able to shape our show. And there will be wizards. We have all worked really hard on this, and we are incredibly proud of the results. We hope you enjoy it too, thats next week. Thanks for watching, and we will see you for click 1000. Hello and welcome to newswatch with me, samira ahmed. Was Boris Johnsons noisy domestic argument with his girlfriend a matter of Public Interest or none of the medias business . And with broadcasting a photograph of a father and child who drowned trying to enter the United States gratuitous and intrusive . Concerns about intrusion and taste and decency around reporting private lives define todays programme. Lives define todays newswatch. It was saturdays Guardian Newspaper that broke our first story, that of borisjohnsons row with his girlfriend recorded by a neighbour but bbc journalists followed it up extensively during the day. Mrjohnson, why were Police Outside your house last night . He has been accused of hiding from scrutiny, avoiding detailed answers about his policies on brexit and tax. Today the questions were more personal as borisjohnson faced hundreds of conservative Party Members and was asked why police had been called