this is bbc news, i'm chris rogers. our top stories... ukraine's president zelensky visits the battered town of bucha — and accuses russian forces of committing genocide. translation: russian soldiers treat people i worse than animals. there is real genocide, what you've seen here today. as for president putin — his team says the images of atrocities in ukraine are staged — and that no war crimes have been committed. a bleak assessment of the future of the planet — as scientists warn its �*now or never�* — if disastrous climate change is to be contained. elon musk floats the idea of changes at twitter — after buying almost 10% of the company.

welcome to our viewers on pbs in america and around the globe they are images that have shocked the world — the pictures of dead civilians lying in the streets of the ukrainian town of bucha have led to worldwide condemnation of russia. ukraine's president zelensky has accused the russian forces of committing genocide and is expected to address the un security council on tuesday. president biden called vladimir putin a war criminal — saying the russian leader should be put on trial. as russian troops withdraw from bucha — which is just to the north—west of the capital kyiv — the extent of the brutality is becoming ever more clear. russia is still denying any involvement in the mutilation and murder of hundreds of civilians. it says the images shown by the world's media are staged and fake.

our correspondent yogita limaye was one of the journalists who travelled to bucha with president zelensky and i want to warn you, her report contains some distressing images. the place where ukraine's pushback against russia is most clearly visible. this street in the town of bucha, just outside of kyiv, lined with blown—up tanks and armoured vehicles. today, ukraine's president, volodymyr zelensky, visited the town, drawing attention to the brutality that unfolded here. "i believe these are definitely war crimes, i believe it's genocide in its purest sense, because children have been killed, women have been raped and civilians executed," he said. through the day, we saw

evidence of deliberate murders. in the village of motyzhyn, a shallow grave was found in the woods. four bodies could be seen half—buried, but officials told us there could be more. 51—year—old olha sukhenko, her husband igor, and her son oleksander, who was 25. she was the head of the village. they lived in this house. officials believe they were killed by russian soldiers for helping ukraine's army. in bucha, in the basement of a building, we saw the bodies of five men, hands tied behind their backs, some shot in the head, others in the chest. pictures too ghastly to show. vlad was helping gather the bodies being found. translation: people have been

shot in the head by russian - snipers, people on bicycles, people delivering potatoes. i can tell you so many stories, but i don't want to. i want to forget them. these men are still to be identified. the mayor says more than 300 have been killed. they are still discovering dead bodies here in bucha, the horror of what unfolded coming to light now. but there are still areas of this country under russian control, and no—one quite knows what's going on there. "is it still possible to talk peace with russia?", we asked president zelensky. "ukraine deserves peace, we can't live with war. "every day our army is fighting, but we don't want the lives of millions to be lost," he said. "that's why dialogue is necessary." yogita limaye, bbc news, bucha.

moscow's ambassador to the un says russia will present what he called "factual evidence" to the un security council demonstrating that western statements on events at bucha are lies that the shocking images of bodies in the streets of bucha were staged. foreign minister sergei lavrov has led the kremlin�*s response to the fury of the international community as our russia editor steve rosenberg reports. this is how russia wants its soldiers in ukraine to be seen — as heroes and humanitarian workers, a caring, sharing army, spreading goodness and light to those it claims to be liberating. but moscow knows the international community doesn't believe that. mr lavrov, the us president has called your president a war criminal and said he must be held accountable. what does that tell us about russia's international reputation right now?

translation: what this says is many american politicians | who started the iraq war, destroyed syria, invaded libya. their conscience is in a bad way. our main interest is what the russian people think about this situation. as for evidence of apparent russian atrocities, the kremlin calls those provocations and fakes. whenever russia is accused of anything, be it the poisonings in salisbury or, in this case, atrocities in ukraine, the reaction from the authorities is much the same — deny everything and point the finger back. because the kremlin has total control of the media here, it's able to persuade many russians that it's right. and the kremlin is receiving spiritual support. yesterday, the russian patriarch led prayers

in the cathedral of the russian armed forces. he told soldiers they were heroes defending the motherland and russia's freedom. from the church, no hint of criticism of methods or aims. but some russians disagree with both. ruslan dostavolov was a senior manager at one of russia's largest banks, but he's resigned in protest at russia's offensive in ukraine and the bank's support for it. translation: russia has created a huge area of chaos _ and lawlessness in ukraine. of course, the russian government is responsible for what's happening there. before the war, i was proud of being russian. there was lots to be proud of, but the war has cancelled all of that out. ruslan took a moral stand, but he has no illusions. the russia he thought he knew has gone.

steve rosenberg, bbc news, moscow. for the latest news on ukraine, there's lots more on our website — where you can see our live page that's constantly being updated by our teams on the ground and our correspondents. that's at bbc.com/news or download the bbc news app. leading international scientists have warned that its �*now or never�* if disastrous climate change is to be minimised. the latest assessment from the united nations inter—governmental panel on climate change says the rise in global temperatures can only be held below one—and—a half degrees celsius — the real danger mark — if governments act immediately. our climate editorjustin rowlatt reports. what the un has published today is a road map for saving the world from the worst of climate change, but it comes with a massive warning.

it is now or never. there can be no more broken promises on climate, says the un. some governments and business leaders are saying one thing but doing another. simply put, they are lying. and the results will be catastrophic. but there is some good news in today's report, so let's start there. the cost of renewable technologies — wind turbines, solar panels, batteries — have been falling far quicker than anyone expected. as a result, the world is rapidly building solar and wind plants. in fact, last year, 10% of global electricity was generated from renewables, according to a report last week. but, says the un, harnessing the power of the sun and the wind will not be enough. the report details how we'll also need to change the way we get around, what we eat, how efficient our homes and businesses are, how we farm, how we produce the goods we buy, how we move

those goods around and how we protect the natural world. in short, pretty much everything has to change, because pretty much everything we do produces carbon dioxide. it is possible, says today's report, but time is almost out. we've got to peak carbon emissions before 2025, says the un, and then cut them back by at least 43% by the end of 2030. and then we need to take them all the way down to net zero by 2050. it is a tall order, especially given that emissions are currently going up, not down. what needs to happen is that we need to use all the available tools we have, in terms of policies, technologies, and we need to start to use them immediately. if that happens, then it is still possible, just possible, to limit warming to 1.5 degrees.

but we'll also need to develop technologies to take carbon out of the atmosphere to balance out those emissions we cannot eradicate. trees are one way, but we'll need high—tech solutions too, and they have yet to be proved, at scale. now, making all these changes will cost money, but it will also deliver huge benefits, says the un. your life will probably get better. that is one of the key results, because there are many benefits with these measures that are needed — better air quality, better health, more active lifestyles, healthier food systems. the authors of today's report are very clear. they say that the fossil fuel era has to end, and end very soon. that conclusion, indeed all the conclusions in this report, have been approved by all of the governments of the world. so the big question now is, will they enable the radical action today's report demands?

let's get an expert opinion from dr isabella velicogna, professor of earth system sciences at the university of california. she's spent her career monitoring ecosystem response to climate change. the world could or will still warm by 3.2 degrees this century, we are told but can you give us an insight into what that might look like? it may look pretty terrifying, but we don't have to think about that because we are going to do better. what it looks like, we will have disappearing species, in terms of animals, vegetables, but i am a very strong believer about what we can do right now can make a difference and we are not going to get there. is

difference and we are not going to get there-— to get there. is it not all a little bit — to get there. is it not all a little bit too _ to get there. is it not all a little bit too little - to get there. is it not all a little bit too little too - to get there. is it not all a| little bit too little too late, no matter what we do now? you go to some parts of the world and you can see climate change is having an effect on rainforest, on animal behaviour, on nature, villages are being flooded, villagers are being flooded, villagers are being flooded, villagers are being starved because of flooding, it is already happening, isn't it? {iii flooding, it is already ha enina, isn't it? , happening, isn't it? of course, but i do not — happening, isn't it? of course, but i do not believe _ happening, isn't it? of course, but i do not believe it - happening, isn't it? of course, but i do not believe it is - happening, isn't it? of course, but i do not believe it is too i but i do not believe it is too little too late. we still have a lot of power to make a difference. it is very important as this report said that we take a stand and that we make a change now. and we can really make a difference. and that is going to make a big change and it can really empower us, you know, the ability to be able to do this. but doctor, we have heard people like you, absolute experts and leading scientists,

year after year, experts and leading scientists, yearafteryear, decade experts and leading scientists, year after year, decade after decade, saying just that, we need to cut carbon emissions, we can do it and turn things around and yet year after year there does not seem to be any change, we are seeing more climate change. do you think it is time we got tougher on governments, world leaders, business leaders, find them, imprison them, i don't know, but do something to force their hand to make them do something? i don't think that imprisoning them and finding them, what is going to make a difference and make them feel they can really make them feel they can really make a difference, we now know more than a few years before that can really make a change in terms of the economic return, their well—being, their quality of life. so to me, it's a lot about how can we empower people and how can we make people and how can we make people make changes now? and we

cannot wait any few years, we have to do it. is cannot wait any few years, we have to do it.— have to do it. is it dramatic to say that _ have to do it. is it dramatic to say that lives _ have to do it. is it dramatic to say that lives are - have to do it. is it dramatic| to say that lives are actually at stake, that is why i talk about imprisonment and fines of business leaders and world leaders that are failing us or pulling the wool over our eyes? but you know what? howl pulling the wool over our eyes? but you know what? how i feel like, what does it mean, life is at stake? climate change is going to affect sea level rises, affecting the lives of people who live in coastal areas. you know, we have drought, extinction of species, yes, life is at stake but what i would like people to feel is that we can really make a difference and it is actually, we are going to have an economic return if we make a difference because it is going to enable us to have more

profit and be more successful in terms of how we will deal with the impact of those changes. i don't know. i always believe we can really make a difference right now so what we need, we need people to get together and understand and policymakers to change policies and make decisions that are going to enable people. the lan going to enable people. the [an is going to enable people. the plan is there _ going to enable people. the plan is there and _ going to enable people. the plan is there and the message is absolutely clear from the un. we must leave it there but many thanks. stay with us on bbc news, still to come: elon musk causes a twitter stir after buying nearly 10% of the company.

25 years of hatred and rage, as theyjump up on the statue. this funeral became a massive demonstration of black power, of power to influence. today is about the promise of a bright future, a day when we hope a line can be drawn under the bloody past. i think that picasso's i works were beautiful, they were intelligent, and it's a sad loss - to everybody who loves art.

this is bbc world news, the latest headlines... ukraine's president zelensky visits the battered town of bucha — and accuses russian forces of committing genocide. as for president putin — his team says the images of atrocities in ukraine are staged — and that no war crimes have been committed. president biden says russia's president putin is a war criminal and has called for a war crimes trial following the discovery of killings and more mass graves outside kyiv. but how challenging is it to gather proof of war crimes — and what are the chances of prosecutions? here's our special correspondent allan little. as russian forces retreat, the evidence accumulates of atrocities against civilians. near kyiv, a man attempting to flee sees a tank and gets out of his car. seconds later, he is shot dead.

nearby, a woman has buried her only son with her own hands. it falls into a pattern of behaviour which is consistent with anti—partisan warfare, or mopping—up operations, that the russian military has conducted in a number of conflicts in the past, and essentially it is aimed at terrorising the population in response to insurgents or resistance fighters operating from their communities. and so the intent is to make the population pay a collective price for sustaining resistance. the precedent for holding political and military leaders responsible was established at nuremberg in 1945. this was the founding moment of international criminal law and the new concept of the crime of aggression acquired legalforce, including crimes against humanity. during the war in former yugoslavia in the 1990s, that concept was invoked again with the setting—up of a special war crimes tribunal in the hague. it took many years, but,

in the end, prominent military and political leaders were brought to justice. this is the bosnian serb leader radovan karadzic. no—one thinks he killed with his own hands, but he was convicted of commissioning the crimes of others, of command responsibility, and will never be released from prison. could vladimir putin face a similarfate? only, says one prominent war crimes prosecutor, if he is charged specifically with the crime of aggression, and no international court in existence today yet has the legal competence to do that. a number of governments are closely examining how you would create a special tribunal. unlike war crimes and crimes against humanity, the crime of aggression is relatively straightforward to establish. after all, mr putin has declared his objectives and his rationale, and there is no legal basis for what is going on in ukraine today. but the yugoslav tribunal was created by a unanimous vote

at the un security council. russian and chinese vetoes would make that impossible today. the yugoslav tribunal also needed regime change in former yugoslavia, new governments, ready to collaborate with the international court in gathering evidence and arresting and handing over former leaders. it is hard to imagine a post—putin russia opening its doors to western—backed criminal investigators, far less arresting and handing over any members of today's ruling elite. butjustice matters in any transition to peace. the woman in white is dzenana sokolovic in wartime sarajevo. a sniper�*s bullet has injured her and killed her seven—year—old son, nermin. she wanted, needed, her day in court. translation: it meant a lot to me. i went for the sake of my child. - i know that nothing| will bring him back, but i would go again tomorrow if they ask me _

i can't tell you how important it was for me to testify. - allan little, bbc news. the world's richest man has snapped up nearly ten per cent of twitter�*s shares, paying almost 3—billion dollars. with me is our reporter stephanie prentice. this makes elon musk one of the most powerful people at the company now. it most powerful people at the company "ow-— most powerful people at the company nova— most powerful people at the company now. it does, he has a 9.296 company now. it does, he has a 9-2% stake _ company now. it does, he has a 9.296 stake in _ company now. it does, he has a 9.296 stake in twitter, - company now. it does, he has a 9.296 stake in twitter, four - 9.2% stake in twitter, four times more thanjack dorsey who started the company and what we are seeing is him flexing that power a little, even in his early hours. if we take a look at his most recent trade. he has in fact initiated a pull and he is saying to you guys want an edit button? that has been an ongoing debate on the platform and something many people have at some point wished for and we know in what

might be a rare moment of comedy from him, he has given these options. we know on april one twitter teased the promise of an edit button, lots of people thought that was in april. but now the ceo has retweeted the pull and he said to users, but carefully because this may have serious consequences. i this may have serious consequences. this may have serious conseuuences. ., ., ., consequences. i would love an edit button. — consequences. i would love an edit button, to _ consequences. i would love an edit button, to be _ consequences. i would love an edit button, to be honest, - consequences. i would love an edit button, to be honest, it i edit button, to be honest, it would have got me out of a lot of scripts in the past! but what is the reaction to the opinion poll and what are people saying? it opinion poll and what are people saying?— opinion poll and what are people saying?- opinion poll and what are people saying? it is get a massive _ people saying? it is get a massive amount - people saying? it is get a massive amount of - people saying? it is get a i massive amount of traction, just before i came down here 1.2 million people had voted, 75% voting yes but there's also been a lot of concern and some people saying perhaps he is abusing his power, some of the concerns are wood replies still stand, would retweet still stand, would retweet still stand if it had been edited, some people saying five edits a month or a timeframe you could edit a tweet, some people

saying this could be a way to tweet misinformation, some people saying anything edit it needs an edit icon on it for clarity. needs an edit icon on it for clari . a, , ., clarity. maybe the time and date as well. _ clarity. maybe the time and date as well. we _ clarity. maybe the time and date as well. we need - clarity. maybe the time and date as well. we need to i clarity. maybe the time and i date as well. we need to know what is going _ date as well. we need to know what is going on. _ date as well. we need to know what is going on. what - date as well. we need to know what is going on. what do - date as well. we need to know what is going on. what do you| what is going on. what do you think the effect _ what is going on. what do you think the effect will _ what is going on. what do you think the effect will be - what is going on. what do you think the effect will be on - think the effect will be on twitter with elon musk there at the top, now and in the future? will we see any more changes apart from an edit button? the com an apart from an edit button? tue: company certainly apart from an edit button? tte: company certainly has had a lot of attention since he has been on board, the share price skyrocketing up by 25%. we also saw some political murmurings starting out of the us, senior republicans tweeting at him saying clean up the platform and also critically saying could he reinstate donald trump? we know he was kicked off some of his tweets during the last us election, as an adjacent point donald trump tried to start his own social media network, widely regarded as a bit of a failure. elon musk has in the past and recently criticised twitter but perhaps this could be seen as

him thinking if you cannot beat them, join them!— them, 'oin them! stephanie, man them, join them! stephanie, many thanks _ them, join them! stephanie, many thanks for _ them, join them! stephanie, many thanks for talking - them, join them! stephanie, many thanks for talking us . many thanks for talking us through that. don't forget, you can get in touch with the bbc on twitter and keep up—to—date on twitter and keep up—to—date on the very latest situation in ukraine online, via the bbc news website. the ukrainian president volodymyr zelensky saying his country once a complete and transparent investigation as evidence emerges of the killing and torture of civilians in the town of bucha. he is expected town of bucha. he is expected to address the united nations security council later. meanwhile president joe security council later. meanwhile presidentjoe biden has called for vladimir putin to be tried for war crimes. in reaction to all of that, the ambassador from moscow to the un denies there were atrocities carried out during the russian occupation of ukraine. and has said world media are guilty of misinformation and fake news. do keep up—to—date on the bbc news website with all of that.

the headlines coming up very shortly. for now, thank you for watching. hello, there. it was a mild start to the week, but it will get colder again later on. 16 celsius, though, on monday in hampshire — and for much of the country, temperatures are still in double figures early on tuesday morning. but it is colder in northern scotland — that's where the colder air is. much of the uk in this block of milder air. and between those two different masses, we have this weather front, and that's where we've got focus of the wettest weather. still could be some rain to clear away from england and wales first thing. it may brighten up for a while in northern ireland, most of the weather action is again in scotland — this is where it's going to be wettest, for many, it's rain, but the wetter weather is moving into the colder air, so there could be some sleet and snow in highland and grampian. temperatures only three celsius in aberdeen, but i! celsius in the central

belt of scotland. could be some more rain coming back into northern ireland later in the day, but some brighter skies, a bit more sunshine on offer for england and wales, and temperatures are back up to 15 celsius. this area of low pressure is sliding these weather fronts across the uk — that one there will push away all that milder air, and it'll be followed by some sunshine, but also some bands of blustery showers on some stronger winds. we still have that wetter weather in the far north of scotland, and snow is more likely in the northern highlands — that's where we've got the coldest of the year — and temperatures won't be quite as high across the uk on wednesday. but that cold air that we've got in northern scotland is going to come south on thursday, with a northerly wind accompanying that, really dropping the temperatures. now there's still some rain threatening to run through the english channel — again, it's taking a more southerly track, so it's moving away. essentially, we'll have some sunshine and wintry showers, the bulk of those in northern ireland, northern england, and particularly into scotland.

and temperatures will be around nine celsius in the afternoon. now there's still a lot of uncertainty about this rain coming in from the atlantic running through the english channel on friday. could be into southern parts of england and wales. into the cold air, there may be some sleet and snow over the hills for a while before that pulls away. but for the most part, it's that northerly, chilly air that we maintain with some sunshine, and again, some more wintry showers. temperatures only around eight celsius, and we'll find some frost returning at night.

this is bbc news. the headlines... ukraine's president zelensky visits the battered town of bucha — and accuses russian forces of committing genocide. it comes as international condemnation grows of atrocities in ukraine — as shocking images of civilians killed during russia's advance are seen around the world. russia denies involvement, with president putin's team saying the images of atrocities in ukraine are staged — and that no war crimes have been committed. but president biden has said for the first time that vladimir putin should be put on trial. leading international scientists are warning its �*now or never�* if disastrous climate change is to be minimised. the latest assessment

from the united nations panel