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♪ >> this is bbc world news america. ukraine attacks a bridge connecting russia to crimea and russia withdraws from an agreement potentially causing a crisis in global food security. from china across the u.s., millions across the globe are battling extreme heat and a new drug that could be a turning point in treating alzheimer's. ♪ welcome to world news america. we begin with multiple new developments surrounding the conflict in ukraine. russia says an agreement allowing ukraine to ship grain through the black sea has now ended, posing a major threat to global food security.

despite that, ukraine says it's prepared to carry on exporting grain. ukraine's president, zelensky said ships are set to sail without russian approval as long as turkish officials allow them to leave the black sea. turkey's president said he believed there russia's president, vladimir putin wanted the grain deal to continue and erdogan also said he would discuss with putin. ukraine is one of the largest world exporters of wheat and barrely. speaking earlier, u.s. secretary of state anthony blinken sharply criticized russia's decision to end the deal. >> it's unconscionable. it should not happen. this should be restored as quickly as possible and i hope that every country is watching this very closely. they will see that russia is responsible for denying food to people who desperately need it around the world and to contribute to rising prices at a

time when many countries continue to experience very difficult inflation. >> the u.n. secretary general antonio guterres also condemned russia's decision. >> today's decision but the russian federation will strike to blow to people in need everywhere. but it will not stop our efforts to facilitate unimpeded success to global market from fooled products and forget losers from both ukraine and the russian federation. i particularly want to recognize the efforts of the government of turkey in this regard. looking ahead, our goal must be to continue advancing global food cure. and global food price stability. this will remain the focus of my efforts, taking into account the rise in human suffering that will inevitably result from today decision. >> and the bbc's reporter is in

kyiv reporting on the fallout from russia's withdrawal. reporter: russia said that part of the deal that facilitates export of its agricultural products was not honored and therefore moscow wants these issues to be fixed and only then are they willing to support this agreement again but they say it's signed a deal with turkey and the u.n. but central from russia. he said we're not afraid of this but it's going to be extremely difficult tachisme across the sea without security guarantees. but this is crucial for the world because ukraine is one of the biggest grain producers and exporters in the world. without in deal, i expect global food prices to go up significantly and making hunger in many parts of the world much worse but russia is facing

pressure not just because of its decision to pull out of this agreement, it's key bridge, the kerch bridge, ha come the u key supply route that -- route that supports its forces in southern ukraine and without that they'll be facing tremendous difficulties in maintaining their control over the south of ukraine. and those are the areas he has launched their counter offensive. >> russia's withdrawal from the grain deal came just hours after the deadly attack on the bridge attack bridging russia to unoccupied crimea. sources have confirmed to the bbc that ukraine was responsible for carrying out that attack. russia said two of itself civilians were killed.

these are scenes. the video seems to be taken near if rail ray track, which was not impacted. president vladimir putin called this attack an act of terrorism. let's get the latest on this. our correspondent is at the united nations in new york. good to see you. i want to come back to the story of russia pulling out of the black sea grain initiative. we heard the u.n. secretary general condemning this decision. tell us about the reaction there and if there are any efforts already to broker a new deal? reporter: yes, there has been condemnation from the u.k. foreign minister. he was chairing the security council meeting condemning russia's decision to not extend the initiative and accuses the russian president, vladimir putin, of using food as a well.

the u.n. secretary general also said he was disappointed with russia's decision and issued desire warnings about the maps. saying the poorest people and poorest countries will suffer as a result. in terms of what's going to happen, it's pretty unknown. ukraine knew this agreement was going to expire. thank you crane grain association said it is looking at alternative different possibilities such as using ports in the river danube. as of yet, there's no concrete plan on what to do. >> the security council has also been discusses the forced deportation of children in the ukraine. how is russia responding?

>> that's right, earlier in then in russia had said that it had taken 700,000 children for safety reasons to russia but they have been accused of illegal forced deportation in which they've been put into essentially these sort of academic camps where they've been learning russian a.c. deepa and so forth. something the u.n. described as a war crime. the u.k. was issuing sanctions in response to that. the meeting is still ongoing. russia's response really has hit back. the quote on the spokesperson. he called the west polices of the kyiv terrorists. he confirmed that the niche active won't be expanded until the west needs its demands. russia says the food and

fertilizer exports they have are being hampered by western sanctions such as sanctions on paper, logistics and so forth. ukraine has also been resp responded -- responding, calling russia out over past incidents like the downing of the plane in ukraine, spreading conspiracy theories about thank you crane. and saying that it would be a much nicer place without russia. >> thank you so much. now to our other big story. a brutal heat wave continues to batter people u.s. a and the tes could keep going up. in greece, wildfires are forcing evacuations for residents and why would live. two separate fires damaged houses east and southwest of athens.

in asia, japan issued heatstroke alerts affecting ten of millions of people as near record high temperatures hit several parts of the country and china recorded its highest temperatures ever on sunday at nearly 126 degrees fahrenheit or 52 celsius. in the heat dome, in the southwest, left tens of thousands under heat warnings. california's death valley, around 53 degrees celsius. just under the hottest temperature ever recorded on earth. let's go to our correspondent sophie long-standing by in las vegas. good to see you. we've heard as well that las vegas is set to heat -- hit break another heat record. what is the situation like there? >> they were expecting yesterday to be the hottest day ever here in las vegas.

temperatures climbed as high as 116 degrees fahrenheit and stopped just a few points of a degree short of the highest ever recorded temperature here of 117 celsius. i'm told by meteorologists that today it's slightly more humid and there's be bit of a breeze which they say is making things slightly cooler but i can assure you, it will still extremely hot. one of the problems is that las vegas was experiencing record cold temperatures. they had more than 260 consecutive days of temperatures below 38 celsius, below 100 fahrenheit and then issued listen i the heat came with a vengeance on the fourth of july holiday weekend and temperatures have been up there ever since. what that means that even local las vegas weren't really acclimatized to this now above-average high temperatures. people are used to it being hot here but not this hot.

i was speaking to the man who runs the ambulance service here in las vegas and he said callouts have climbed by more than 40% and many of those, they're attending to people with heat-related illness. people are going to pool parties and think they're cooling off bull actually they're also at the same time sometimes consuming allege holic drinks. and people around aren't aware of themselves becoming dehydrated. advice from minorities, if you can, just reduce your exposure to the heat and stay indoors, in air conditioning. lots of people have to work and if you're walking to work a couple of miles, you're suddenly in this heat for an extended period of time. even tourists, if you're walking down the strip, you can become very distracted by all the sights and sounds of las vegas and not become aware that you

are dehydrated. stay in and drink lots of water as much as possible. >> sophie, on and off for speaking with us. and that heat is creating problems for emergency crews battling four wildfires amid a triple-digit heat wave in southern california. one fire has torched nearly 8,000 acres. as of monday morning, 35% of the blaze had been contained according to officials but forecasts say extreme heat and low humidity my hamper firefighting efforts over the next coming days. in spain thousands of residents on the island of la palma have been urged to evacuate. a report from madrid. reporter: the heat wave is expected to continue into the middle of the week at least and these very hot, dry conditions, of course, increase the risk of wildfires and in the canary

islands on the island of la palma, a fire has been burning since the weekend and also devoured around 4,000 -- of land. many people have now returned to their homes after being evacuated and firefighters are still trying to bring the fire under control. these temperatures we're seeing in spain are being replicated in in other areas of southern europe, particularly southern italy, also in the balkans and greece. >> we can speak now to karen mckinnon. an assistant professor at the ucla institute of environment and sustainability. karen, good to have you on the freshman. any idea how long some of these heat waves we're seeing will last? >> we can draw pretty well on our weather forecast models to tell us and we can already see some of them are going to be

somewhat long lasting so we need to be prepared for the long haul with this heat. >> in the u.s., ten of millions of people are under extreme heat warnings, especially in the southwest because of something called a heat dome. can you explain what a heat dome is and why is -- it is occurring? >> certainly. a heat dome is basically a weather phenomenon associated with heat waves. associated with relatively high pressure over the recently. still conditions, knot too much wind and you have a lot of heat coming down from the sun and hitting the land swatches and that just warms everything up and in cases where the heat dome sits still before for a long time as we're seeing right now, that can cause long and persistent heat waves because the heat builds up over the course of the heat wave.

>> you led research into the felt's extreme heat wave in 2021 and it found that heat wave was a once in 1,000 years kind of event. you said at the time there wasn't evidence this extreme type of heat would be a regular occurrence. what exactly are we seeing? >> i think that's a great question. a lot of us question what we're seeing. the first thing i want to mention is that the climate change signal for all of these heat waves is very, have, obviously -- obvious. one of the most basic components of climate change is that things get warmer. when you're in the summer and things are already warm in the summer. we're pushing those temperatures higher and higher. i think people say oh, the global mien temperature is up by a degree. and that might seem like a small number but the land where we

live actually warms faster than the globe as a whole so we're seeing actually faster warming than that global mien temperature change over land and across the global land as a whole, for example, temperatures are increasing -- i'm in the u.s. and i'm talking fahrenheit. they're increasing about 1 degree fahrenheit on average per 20 years. there are certain places, europe is one, where the rate of change can be twice that. in a place like europe, for example, compared to the 1970's, we're seeing temperatures in part due to climate change that could be four or five degrees fahrenheit warmer nan what we used to have. and then if you add to that, no matter what, we have heat waves. during the summer you push things that much hotter and that can really take us over the edge

into what appears to be these very extreme events. >> you're saying we're seeing temperatures increase faster than the global temperature rises that have been reported as a result of climate change. so what is creating that phenomenon? >> there are two things going on. in general, land warms more than the ocean and most of our globe is ocean so that global mien temperature is a little bit deceiving if you think about what happens to land. there's a couple of reasons land warms more than ocean. one of them is because it's basicly dryer and one is because it responds faster to the heating associated with climb change. that's kind of an amplification you get in general. there are certain places, europe is a major one of them, where we start to see more than that land average kind of hot spot forming, that is believed tock interactions between the land surface and the atmosphere. >> is there anything we can do

at this point to still slow or stop this trend with extreme heat? >> these extreme temperatures are very much a signal from climate change but what we can also know from climate sainttists, to reduce those temperatures, we need to have less co2 in the atmosphere so stop emitting co2 and eventually remove it from the atmosphere. that is the primary thing to do. in the meantime, adaptation is very important so being aware of the danger that heat can cause to our bodies and not choosing to go out into the heat if you can avoid it or using things like air conditioning or other life style modifications. >> what do you any policymakers should be doing right now in some of these really hot places? >> in terms of the local level,

i think the biggest thing is encouraging adaptation measures and making sure people have access to cooling centers, access to water and are aware are of the dangerous of the heat. kind of looking longer term. in addition to reducing and removing co2 from the atmosphere, we really can, i think, adjust our cities and mange changes to the way we live in order to allow us to adapt to extreme heat because we're going to have it for a while regardless of how well we stop the co2. >> thanks for joining us. continuous rainfall. in the u.s. a massive search is underway for for two children swept away by floods in pennsylvania. the children and their family were on their way to a barbecue

when their car was overwhelmed by the floods. their mother did not survive. in this south c.e.o., the country's president has led to a complete overhaul of the cou country's response. road clapses damaging and destroying homes. as this extreme weather happens around the world. u.s. climate envoy john kerry met his counterpoint in beijing monday. kerry has been complimentary of the chinese efforts to reduce climate change in his public remarks but says they need to use less coal. after the first round of talks, he tweeted "the climate crisis demands that the two largest countries of the world work together on the earth's warming. talks will continue until wednesday.

they're expected to focus on the topics that kerry mentioned in his tweet. u.s. president biden has invited israeli prime minister benjamin net -- netanyahu to the united states. the leaders are expected to heat before the end of the year. the prime minister's office said that mr. biden made the invitation over a monday phone call between the two leaders. mr. biden's invitation comes on the eve of israel president's isaac herzog's visit to washington. he'll address the u.s. congress on wednesday during his visit. now to a new drawing that could be a breakthrough in treating alzheimer's. here in the u.s. the also highlier's association estimates 6.5 million are living with the condition. something the association predicts will steadily increase. in critical trials, a new drug

was found to slow the pace of the disease by about a third in early stage alzheimer's. we spoke with one of the parents from the trial. >> i seem to get more confident every day and i'm sure this is going to be successful. they'll get all the rubbish off the top of my brain and i'll be back to about that. >> with recognition health, a you went k. braced research institute, discuss what the findings mean. >> this is really significant. this is one of the biggest breakthroughs in so was this disease is a pandemic. it's getting more and more common. >> now, in drug citizen have some serious side effects, including the potential for brain swelling. eli lilly, the manufacturer says they expect the u.s. food and

drug administration to decide by the end of the year whether to prove the use of the drug here. morality codes will make women comply with strict dress codes. those who insist on breaking the colds may face legal action. this after 22-year-old died in police custody after being arrested for wearing her ha jib incorrect live. federal judges said that the states should have a second majority black district but alabama republicans rejected those calls. the directive comes after the u.s. supreme court confirmed a lower court ruling that ala alabama's current map likely violates the voting rights act. an antibody tab approved and it

will be administered as a still injection before rspc in the fall and winter months. and train derailed and evacuees were allowed to return early monday afternoon after authorities conclude that would no hazardous materials leaked from the rarely cars. the owner of the track has been under highened scrutiny since the february derailment of a train in ohio which spewed poisen fumes into the air. an apple iphone sold for $100,000 at an auction in the u.s. unopened it was described as exceedingly rare and in special condition. testifies discarded only two months after its launch in 2007 this phone was sold for $500 u.s. narrator: funding for this presentation of this program

is provided by... narrator: financial services firm, raymond james. narrator: funding was also provided by, the freeman foundation. and by judy and peter blum kovler foundation; pursuing solutions for america's neglected needs. ♪ ♪

introducing a technological achievement so advanced... it rivals the moon landing. wow! ok. rude. that's one small step for man.

one giant leap for mankind. ♪ geoff: good evening. i'm geoff bennett. fldwaters rage and dangerous heatwaves grow worse,posing serious risks to millions of americans. the end of a russian grain deal with ukraine raises fears about global food security. and police under new scrutiny for their use of tasers, less lethal than firearms, but a weapon that can still be deadly. >> the reality is we need an entire paradigm shift around when force is necessary for law enforcement. ♪ >> major funding for the "pbs newshour" has been provided by --