in a society full of contrasts, the indian age. in 45 minutes on d w. d w. news on the note. follow the there are a 1000000000 people on the planet and more than half of us live in urban areas. living space is getting tight. temperatures are rising and cities are getting dirty or 2. it's time to cool things down. how about with plants? they help cut air pollution to rats. meanwhile, don't mind heat or dirt. they multiply rapidly know on everything from fin liners to cables, and can transmit diseases temporarily. and they're successfully kept in check. welcome to dw science show the

funding, a booming capital with a booming pro getting population. sasha calculus works. the cities was a company. he deals with problems in the sewage system, such as rants, because here like elsewhere, plenty of them living on the ground. really not the on your found higher quality in house. 3.5 to 4000000 residents. 6 a growing c. i'm with food comes to me available. that should be around 2000000. right. so yeah, but i believe the number is much low and i because you'd see these routes. when i opened the shaft, i don't see save 10 of them running away, which would mean that what hundreds in the tunnels who are not in the city definitely has a large number of them, i guess between 20300000 souls. to keep the rats bay a poison bait with a strong anticoagulant is inserted into every other man how

a man a few days of to reaching it, the rock dying from internal bleeding rats and not welcome in germany's south west either here to a highly active poison is the primary method of control big stuff. that's why we use the 2nd generation active ingredients and a bait like this. we're going into the milligram range teaching. it just once is enough to kill the rap. so that's the, the step where does the rest of the points and up we were in a forest in north, in gemini wildlife biologist, or the corner from butlins, like mits institute for wild life for such is keen to find out how far right poison can spread throughout the environment and whether it can be found in wild animals like this young white tailed eagle gift to that so i can get that out to you. and um, i know the 2nd generation talks and have

a house life as around 4 to 5 months item. yeah. but sometimes up to a year. so you can say it varies from about 5 to 10. um, as long as it can do that, how long the talk sends are easily detectable in the old bins of the animals that have ingested them. the team of biologists have indeed found wrapped points and in the eagles blood digits. e to poison dropped. possibly even the rats so not typical pray for eagles, and they usually good at hiding too. but most of the so many route suppose and that not to own if the managed to hide, they stay accessible. all they move around in vegetation like total grass and then cool by predators. you haven't done form these then often dying from the poison themselves. it's called secondary poisoning. and unfortunately this happens quite often. this complied, i left the points each for me, so the eco lives not an isolated case. fox is, poll caps had chokes, and song bugs can also be contaminated with wrapped points and sometimes dealing as

a result. it's an alarming situation. the poison is more widespread in the environment than previously sold. that's why all of aqona and his team are also keen to study dead animals. the autopsies finding is dramatic rodents. it seems weakened by rat, poison, and found in the wild can be welcome, pray for white tailed eagles. just keep the windows won't be fine. there's also new research showing that even fish can ingest and accumulate 2nd generation, right poisons, and the white tailed eco, whose preferred praise fish can end up accumulating this poison from fish through its role as the end consumer deficient summit down for this can lead the police and bates placed in the mine host to be washed into the sewage system. that's because in 80 percent of old gem and municipalities, police and bates hang loose and unprotected in the mind whole. but then wants to

prevent the rat poison from spreading into the water system. so engineer is a testing out new methods like this floating blackbox. inside the air underneath is a foot which provides the base as a cable which secures the bowl and allows it to float. it stands securely and the bait is safely inside the bowl. also, the handling is much best time to best with him. thank and right populations can be cubs without using any points in the tool. the next test shaft contains a high tech device. a trump triggered by census controlled via the internet. yeah, man ends, lackland esteemed when we now have an impact from the system in here, which is designed to ensure that the rats killed by spikes as they pass through the so in other words, that kills quickly and precisely, and then carried away in the waste water flow for 2 years,

what's unique about the system is that it communicates with us. we can enter the results online and see the numbers of rat skills. and that gives us an overview items that this is a see. and such data collection is a priority in gemini southwest to a hey, a sewage way because of testing another ineffective system movable flight in show us the police and remain securely in this green container during floods and heavy rain full direct, still easily find the way to the bank and an electronic monitoring system registers each visit to the fences and we have a total of 9000 miles and your last and every 2nd long contains police. and this will be more than one. before we introduced the system we use to use around 900 kilograms of poisons paint fun. for now it's just 40 kilos so well below 10 percent

. looks at technology as i'm looking right. capture these initial steps seem promising in terms of tackling the road in tissue and reducing damaging effects on vice versa. um the environment hi summer. the heat can be especially impressive in urban areas. small animals attempt to cool down by panting or lying on cool floors. we people sweat it out or turn out the air conditioning. if we have one and many do, but air conditioning use, it's a lot of energy and that's not the only downside. we take a look at the thing apart. the air conditioning units are you bit cortes and singapore to help cope with the hot and humid climate. but these appliances are part of the problem because they contribute to rising temperatures. luigi them yolanda studies architecture and sustainable design. with the help of

a thermal imaging camera, she's identified a vicious circle as well for a small key to the increase, the higher the max. so it's not what further exacerbates the situation in single port is the rapid growth that's underway. there are more and more residents and more and more concrete. in recent years, temperatures and single poor have risen twice as fast as in the rest of the world. data set, good on, has lived here for years. but dealing with the heat every day is challenging. even for him, you can see, right. i mean, you saw me even a walking in and i'm still little bit for sliding here. it's actually 10111011 o'clock in the morning is over the cost and the human it is picking up. data set around is an architect and botanist,

affectionately known as the plan pushed. his weapon against climate change is as simple as it is, effective vertical green spaces on the walls of buildings. you can feel when i'm standing here. just close beat by right. i can feel these heat reduce significantly because the plants up with the rest the right are aspiring and photo synthesizing when the plausible to synthesize that release oxygen. and actually basically picking away my compound off site pop up to synthesize. so when you have got that biochemistry going around in the city, you'll realize that c, o 2 level drops, the immediate heat actually drops. and that makes a big difference. 30 different plans species are growing on this wall of sophisticated irrigation system provides the necessary nutrients. workers trim the greenery twice a month in the long term. it even has financial advantages or yeah, conditioning cost inside is actually cheaper and lower. so that's costs your saving as well. so spending a few dollars to spend a few, a few dollars to save

a few $1000.00 is actually a very good business, new e juniors and shows us another building that illustrates what a difference green and we can make. this facade is partly covered in plants. the other surfaces, steel and concrete are completely exposed to the sun. the difference in temperature is a whopping 5 degrees celsius. but singapore can to combat rising temperatures with greenery alone. it's also promoting sustainable buildings and allowing more spaces in between them. the new university, for example, has solar cells on its roof, hoping ensure net 0 emissions. professor vater set good on teaches here the shows us how simple ceiling fan is enough to keep students cool. it's all very open plants allowing a gentle breeze throughout the premises. the building is actually quite similar. if

you go into the forest, there's some truth, some building stuff, very tall, some trees every, all the different may as well. so trying to bring back for us architecture and the city escapes is very important to try and involve designs of the future as well. so nature based solutions are part and parcel of that and they look spectacular to this hotel and the center of singapore has won awards, the leaves and regions with flourishing green terraces and gardens single floor subsidizes sustainable architecture and is pursuing and vicious long term goals. 1000000 new trees are to be planted by 2030 and the plan is to have so many parks that no one will have to walk more than 10 minutes to be surrounded by nature. of this project is called cooling singapore. the researchers have program good digital twin of the city. this allows them to

stimulate cold temperatures can be lowered with individual projects. a thermal image showing to these daily temperatures and single port is shown on the left. on the right, what it would look like if all buildings were energy efficient and sustainable, the whole city would be $1.00 to $2.00 degrees cooler. single power sees itself as a driving force for southeast asia in the fight against rising temperatures. and is investing billions on like other developing countries. however, the wealthy city state can afford to do so. one of the big problems with cities is that the many sealed surfaces like concrete and as far as the store heat. and when there is heavy rain, the surfaces stuff, the water from infiltrating the soil, that's one reason why many cities are starting to plant tiny forest. these micro

forests can help bring temperatures down, store water, and much more. yeah, there's, there's differential, so it has a dream. he wants to grow many primeval forests known as tiny forests across gemini . after raising 14000 heroes through the crowd funding the forest scientist and his colleagues planted the 1st tiny forest in the gym and state of brandon book, a total of 3000 round cub sounds, shrubs and trees. all native species did sweet sound too. they compete some night and save gro relatively quickly, japanese plum, socio logistic care to, milwaukee developed the tiny forest concept in the 1980s, the best small primeval forests, rich in species, wild and resilience, and particularly suitable for cities. could i help him from on foot by spilling with the cobra? i wrote

a few examples of what i mean i worked with forest could potentially developed and fil, a very dense green movement of buttons for sheet and various shrubs, climbing clumps up to really told trees. at the back, so that after a really short time, you have an impenetrable primeval forest or a rep to cover fundings in the hospital or the not a windows or vice. and that's can have a cooling effect on areas suffering in the heat. stuff on shel phillips to natural processes occurring in native woodland, to understand what tiny forest sneed to strive as it does. here i'm from the i'll leave the by a mass that drops from the trees. we tried to compensate for in the 1st few years by laying down this is drawer or chopped, hardwood forest and it s young with the aim is to ignite a process of field loss. we provide the forest system with what it would normally develop itself over a few decades. i'm a task force and then after a short time and leave it to it's um, devices and to buy lots of stuff for it. so it doesn't need to the boy as we build

up, this is toya life and this human. because if the from the stopped on the phone on the phone, on the shelf or into his colleagues in which part of this field with nutrients, according to milwaukee, these concepts before planting the trees and shrubs, they left another part of the soil as it was. so nothing matched. would that be a difference? a 3 d scanner shows how the plums, the developing and the results are clear. on the right hand area where the soil was prepared, there is far more vigorous groves of incident. this is the very most vital corner we have. it's not. and so big the former street next, but wants to gone or, and susie has them for tiny forest throughout gemini. he's now on his way to a hospital campus with a piece of wasteland which will be turned into a forest. the soil has already been prepared as much to do before the 1st trees go

into the ground, stiffened shelf and mix is native ground shrubs. wood, the pumps on trees, seedlings into planting bundles, hospital stuff, and patients interested policies. and a bubble of children. a will be invited to the planting day as a specialist and so this is a tree. this is x rays. now, when we come to treat them and we make the whole deep enough for the rates to fit into the sea, we want to see roughly where the root and that's, that's where it should be in the ground. so what do you, what's in alpha? and besides the important line to fish differential, so tiny forests complaining, important educational role teaching the next generation how to pronounce a green power house amid the assaults and concrete that's important because tiny

forests have a lot to offer cities in the face of climate change. they clean the arrow of particulate matter, sulfur dioxide and nitrogen oxides and boast 18 times more bio diversity than in natural mixed forests. surface temperatures in the for a shade can be up to 30 degrees celsius lower than on sealed surfaces. and they have a cooling effect on surrounding at temperatures, to dropping them like 2 to 3 degrees. really excited the so what about most we can the far as slight your own house. think of it as a rule of thumb. the tiny forest is watered for another 2 to 3 years and then no longer needs any outside inputs. that kind of inputs from alcohol. and lots of time and commitment went into preparing, implanting this 1st tiny forest to you. but off to just full months, it's paying off the form of waste and is already offering up its fast delicacy.

floods, whether they're caused by heavy rain or rising sea levels. they can have a specially serious consequences in cities. if the water can't drain away, houses and st skipped flooded to protect itself from this threat by is caring for its main grow forest. then it says built a multi 1000000000 euro flood barrier. and other cities are water proofing to go from bad sweden, sometime in the future in just 5 minutes. that's more than 15 liters of rainfall per square meter. the voltage comp drain away fast enough is this heavy rain could look like one day in the swedish, the, to the. fortunately this was just a simulation for the people have gotten back this kind of disaster scenario. it's hard to imagine that the city is already preparing for an emergency go from bucks.

it's right on the waterfront sea levels here in the north of a so wrong thing due to higher temperatures and melting places. and extreme weather events are becoming more frequent. combines this poses a serious threat to the city, says deputy man car in plato. we are the most vulnerable of the city in the sweden, in fact, because we are expressing from from 3 directions to have the sea level and the storms coming from the west and pressing off the water to the city from, from the sea. and we have uh, the, just the river we chose, so we'll have a rise senior water level and the rest ending us from that side. and also the heavy rain falls floating in downtown, got some bug is knocked on, come on even now. these images are from august 2023. realistic visualizations of these potential scenarios could get the right people to

pay attention and take action. that's why go from bugs is created a digital twin, and it's based on real data. in the 1980s, the city become compiling all the information that code about soil conditions cool to run sewage pipes on the road and rail network. so every single tree is nurtured and essentially accessible data base with this page and height from what can read every data within the city. and we also have parts of the data, our open data into the community. actually we have the based on this data. eric sean sons, to recreate to the city with all its details in 3 days, the power method, even the rates have the right shape and even with the lease or in the right place, my work. and with this parametric modeling, we can change the safety and initialize it in several different ways. so that's

a very strong mechanism in the date of when you're just working with pattern metric and this obsession unit c m science sunset depicts what will happen in a sea level rise is even faster. and also the various meshes that protects go from bugs in the city. sunset from the volta. these yellow lines represent low holes that would hold back ripple tough of advice. and in fact, some of them already being built lisa x room as the climate struck to just for the golf and back city planning office. here at fuckers, can we have a we have the race to the wall next to the shore to protect the the city. and with that, the, on the inside of the was the height of the wall was precisely calculated in advance . this is just one measure to protect the city from rising sea levels. the digital

twins could be good for the city to show all the measures that needs to be done and why it has to be done. and i think it's a good tool to visualize with the positions and for all citizens and to show what could happen to guttenberg in the future. the problems are known now it's the case of making the right decisions. for example, big looks could be constructed, the seal, the city of from the state. and during heavy rain especially created open spaces could ensure that the water collect small, quickly and can see poway like here. and then you develop meant that it gets a risk lisa area can contain 500 cubic meters of water. when the heavy rain is coming, it's 10, collect to water here and save the building. some of the housing center. everything around the greenery hit also helps to provide

a healthy oven climate. do you have a science question, then send it to us as a video, text or voice message. if we answer it on the show, we'll send you a little surprises the thank you. so come on justice. the this week's question comes from klaus w, from pato, born in germany, the, is the sketching lights, or is it gaining weights? the box on it weighs almost 6, set, tv and kilograms. this can be determined funny accurately, with the help of sent to lights and the mathematical formula the weight is constantly changing. it has enough gravity to retain its atmosphere,

but in the days of gases. gravity is no longer sufficient and light to elements such as hydrogen and tedium disappear into anxious space the the asked lose is around $96000.00 tons of weight this way each year the radioactive decay reduces the weight of all planet to this convent samantha into energy which then escapes into space as radiation. this happens mainly in the interior and the rock such as o tonight's near the surface. radioactive decay accounts for around 7 tons of weight loss if we do one space, travel, so low as the weights when we send rockets into space to transport satellites and exploration robots to other select steel bodies. the building material that these

high tech machines are made of comes from us. the space exploration lights into the planet, fly around a 1000 tons per unit. but this is not just losing weight. it's also gaining. it's called the thanks to a constant trickling down of duff to from out to space. this cosmic dust comes from asteroids overtaking the sun behind moss and a bubble from comments. sometimes we can even see the specs of dust shooting stalls and every now and then larger chunks crushed to the ground as meteor writes . or, and if this adds an extra $16000.00 tons of weight to the us each year. so doing the math, we end up with a weight loss of $81000.00 tons per year, which means the us is getting lights, but only by a tiny fraction of

a percent. almost nothing the and it's all from us this time around. thanks for watching. we're back soon. see you then, and in the meantime, take care. the

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