because population is growing fast and young people clearly have the solution that future loans is 77 percent every weekend on d w not all green roofs are equal. we look at how researchers are trying to boost their benefits. and dw science program is off to gonna to meet women learning how to best create a backyard vegetable gardens. we also take a closer look at the herbicide, clive to say good for bombing, but bad will people ah, hello and welcome to tomorrow to day.

crop spraying is common pesticides. broadly speaking, chemicals that kill pests weeds and funky can help increase yields. and farmers are using more and more of it over 2000000 tons in asia in 20. 19, almost a 3rd more than 20 years ago. south america has recorded arise of 143.5 percent over the same period. more chemicals are also being used in farming, in africa, central america, and the pacific region life. the site is probably the most widely known a few years ago. the international agency for research on cancer classified the herbicide as probably carcinogenic to humans. ah,

life as it is often used by gardeners or farmers to get rid of weeds destroys plants, a grass is all in all with a shout of ground. for dr. legalese with wrong kills reason. more than $800000.00 tons of life, or say to use each year globally on rail tracks in gardens on christmas tree plantations. but mainly in agriculture. many farmers demit essential. mm hm. through a couple of weeks before we wanna proceed in the ground, we screwed it this way. they could neighborhood many foodstuffs, contain life, a se, residues there even found in hygiene products made of cotton like tampons. the herbicide is produced by dozens of companies worldwide. one of the biggest is germany's farm . a giant buyer buy also sells the genetically modified seeds that are resistant to

the herbicide, but dispute still rages over one big issue. some scientists say that the herbicide harms the environment and causes cancer. others say it's harmless. so just how dangerous is life a st really? mm. let's take a closer look. the chemical was 1st created by a swiss chemist in 1950. it's odorless and water soluble. but the pharmaceuticals company that he was working for found no use for it and sold the rights to the substance. it took another 20 years for a u. s. chemist called john e friends to recognize what life estate was best at killing plumps. france was working for the chemical concern monsanto. the company marketed it under the brand name round up. because it's no longer under patent. other companies can now manufactured life estate. so how does it work?

oh, pumps absorbed glass, you say to fully they leaves. it's drawn into the roots where it blocks a vital metabolic process. ready disability the she can make pathway is the fancy name for this biochemical pathway on the shiki. make pathway is responsible for the synthesis of 3 important amino acids in amino loyalton. ready maria think is an agricultural scientist at the university of castle and has done research, young life, a site been de when they're not produced because the process is inhibited than certain substances can no longer be created. often plants are no longer able to carry out photosynthesis. that's why plans that are sprayed with life of st. donnie, unless they're resistant. that is, this is sticky. but how does glad for sate effect animals and micro organisms? researchers have discovered that the herbicide homes, many micro organisms because the shiki mate pathway also plays an important role in

microorganisms like bacteria, fungi, and algae davis. we know that 5 milligrams per liter when we test it in the lab inhibits a lot of microorganisms that means 5 milligrams of life was said per liter in the lab, inhibits the growth of many microorganisms. it doesn't necessarily kill them, but it hugely slow down their growth. and that could also affect other life forms like us humans. because we live in symbiosis with micro organisms ordered mclaughlin, without a micro organisms in our digestive tract, we could not properly absorb nutrients. we humans don't actually have many of the enzymes that are needed to break down certain substances. they come from mike or organisms instead. if we didn't have any micro organisms inside us, we would be dead. researches have discovered that life a sate can impede insects symbiotic relationship with micro organisms. for example, it damage is the got flora of bees making the insects more susceptible to illnesses

and parasites. and it also disrupts their sense of orientation. mm rats exposed to play for said showed symptoms similar to those of depression as well as suffering from metabolic problems own. the herbicide also has a negative impact on earth, worms, amphibia, and fish. and how display for say to fact, humans, does it cause cancer? this question still has not been conclusively answered the licensing authorities in the e. u and the u. s. say that the herbicide does not pose a risk to humans. bounce in early 2015. the international agency for cancer research declared that it probably is carcinogenic and that it can damage dna. 2 different answers to the same question. so what's going on? let's look at how the different agencies operate. the authorities that have

approved lie for say to mainly rely on industry studies primarily carried out by the manufacturers themselves. these studies are not usually publicly accessible because they are seen as commercially sensitive the international agency for cancer research i a r c. by contrast, has investigated all the scientific papers in the public domain. it didn't have access to monsanto studies. so the conclusions were based on different sets of data . the question is, how reliable is monsanto's data? these are induced, these industry studies that are conducted are largely low, lot in their own clarity, but largely very shoddy in terms of their methodologies, jamante z fleet canals. mila is a cancer research at the university of vienna. he's assessed 60 for industry studies. the manufacturers were forced to publish these studies after an n g o filed a suit with the european court justice cannot. millis says that 85 percent of them

was scientifically under par dish tool didn't default and to her ogden funding the studies that were assessed and taken into account by the authorities by the health authorities are out of date is dalton since 2 weeks for i that's the method used here cause extremely unreliable, that is, extreme overlays can only detect 4 to 5 of 2 and carcinogens nur fee up is for you may just as well throw some guy 60 of those haste up to colonel who offered his conclusion. the studies do not offer adequate proof that life a site is homeless. so what does buy, i have to say about that. what is the onboard with our response to summarize briefly, is that mr. kenneth miller is right to the extent that of course old studies. some of which were carried out decades ago could not meet the latest guidelines in that simply impossible on what he could notice of christian cancer is in charge of the

licensing of life. a site for bio lift and because ultimately all these studies were carried out multiple times and have also been assessed worldwide on many occasions and time and time again has been shown that the authorities all agree life as 8 is very, very safe. but many experts disagree, they say life a sate could pose a danger to human health if really exposed to the higher. oh hi, a lateral or long. ready exposure, pierrette and they, you know, you'll get a higher risk. that's how, what our find nisa, actually she'll, that's lou ping chang, a toxicologist at berkeley in 2019, she reviewed the studies that had appeared about life estates and cancer, in particular about a type of cancer that affects the lymph glands. non hodgkin's lymphoma,

he reported so 41 percent again, chris ah la hodgkin's lymphoma. i rest, you know there risk armand, people expose the to glass oscillate or what we call collateral se, the based her precise. so, so that's a, that's our major funding. the teams study data on us farmers. the findings going for say to damage is dna. it's gina toxic. what are we know? i think is a sofa. is glover say to, i mean, cause it's, you know, toxicity, actually many, many studies. yes. i confirmed that in humans study and animosity the higher level of exposure you have, the longest time, a pure radio exposed to the higher rescue. that's what we see. to sum up, it's a question of dosage. the more life a said that humans are exposed to the more likely they are to get cancer. so to

conclude, the herbicide is an important aid in particular for many farmers going for sate helps them to produce higher yields. mm hm. the herbicide leaves residues in food, but they are so small that they do not cause any direct damage, at least and they are mainly ex greeted. but any one repeatedly exposed to high concentrations of life. a sate like farmers, for example, faces a greater risk of getting cancer according to research as it stands to day. the herbicide is harmful for many micro organisms, even in small concentrations. and that poses an indirect danger to animals and perhaps humans to do to these issues. some countries are mulling a ban in the e u. the license for life as 8 runs out at the end of 2022, it is still unclear whether its approval will be extended or not. so it's time perhaps to look for alternatives. blue.

there were plans to reduce the use of pesticides by 50 percent in the european union by the year 2030 that could give a boost to buy a diversity. one research institute compare different agricultural areas over many years. there was an enormous variety of wild flowers where pesticides had never been used. those plans attract insects within actor fields that were farmed for many years without the use of any pesticides had over half the amount of floral diversity. while conventionally farmed fields were very poor in comparison, lots of chemicals mean little by diversity. ah, agriculture commodities are traded globally, like wait, for example. as

a result of the war in ukraine, it's price is rising. that is endangering food security in countries which depend on wheat and other basic foodstuffs impose. there are many reasons to import food. in ghana, farms are too small to supply the country's entire population. and e u. farm subsidies also distort the global food market. how can local food production be increased in ghana? well, this idea nice pretty close to home. a crowd of women is gathering to get some gardening tips. growing fresh produce isn't hard and the benefits are enormous. when the thought coming out, then they'll be here in northern gonna alberta. acosta and her team are showing local women how best to create a back yard vegetable garden. the small organization started out as a so media project. so we are all pleasant together and soon gathered momentum,

attracting a growing number of female followers. we had seats, it's our phase. we had some small guiding tools. so we sort of advocating ah, putting on social media, that's if you want to a backyard guide. and as contacts us and i it's was i'm as i do it as you though at green me those call we agree to require within a week, 700 volunteers signed up for the one household, one garden program. many of them were women who had got out of the habit of gardening, or whose husbands didn't want them working in the garden. but during the pandemic, food prices rose dramatically well but lovely, and many people decided to go back to growing their own vegetables. once they complete training, the women are awarded seeds and a pair of rubber boots. they'll be going home to plant tomatoes, onions and peppers. most of them if their vegetable patches flourish,

they'll even have enough produce to sell. so they now fighting. yeah, i didn't, those would i have learned to you will benefit me a lot because some guy can make some money with what we've been trained to do that . i've ever thought tennis. it will also help mothers feed their children up to every harvest. why this could be very good business school. me got beeson as only the women learn new skills and hopefully start to earn an income too. oh, but not every one approves alberta. cosa and her team make a point of talking to participants, husbands and the village leaders, how to transplant, to convince them that it's in everyone's interests, nazi at guidance. everything that we do want to say we are very positive about this, our group. and we know that there would, ah, there we implemented, i don't a day, we want to see them more empowered. we want to them to be proud of themselves as

women seeing women learn to take pride in their achievements is what drives a cosa to day, she's just shown over $100.00 women. how to be more self sufficient, hopefully not only their gardens, but also their self confidence. will blossom and flourish. we asked on d. w, social media channels. how do you think we can secure enough food for all people worldwide in the future? alexa mike itala wrote many countries are able to grow enough will themselves, you only have to believe in regional instead of large scale farming. that's kenneth joy's got in touch to say that food security begins at home by growing your own vegetables. and by teaching families that rise isn't the only stable food in agricultural schools, alternative food variants are being introduced. these include corn, potatoes,

bread, fruit, sweet potatoes, cana bananas, et cetera. ivana wrote, you have to encourage the use of local seeds again. find people who are consuming things unnecessary and mont. maria takes a practical approach. every household should grow their own food to feed themselves . thanks for getting in touch. here are some tips for cultivating your own garden. so a bunch of seeds, water them, and presto. you have a flourishing garden, unfortunately, it's not that easy. the neighborhood effect plays a significant role. taken apple tree, it needs to have a populating partner nearby. a different variety of apple tree. cross pollination is essential for apples to trees of the same variety. can't cross

pollinate, they're considered self incompatible. beauty vegetables are different. they tend to fight for space in the garden also for nutrients. tomatoes, for example, require a lot of room. they benefit from an undemanding neighbor such as lettuce. potatoes, meanwhile, are also competitive and can completely deplete the soils, nutrients for centuries, people of understood which plants make good companions in the vegetable patch. milva is a self sustaining crop growing system that produces maze, beans and squash. this gardening method is also known as 3 sisters, planting the amazed provides of frame for the beans in turn. the rise opium on the roots of the bean stalks fixes nitrogen in the soil. the squash helps shade the ground and keep it moisture. that means if you were weeds, grow, good news for the gardener. of perfect example of companion,

planting gardens and greenery are springing up in our cities. latin. america's biggest evan garden isn't. if avail on the brazilian city of ria diginero, supplying residents with fresh vegetables, one women's cooperative in ecuador capital quito is growing vegetables to feed themselves, but also to sell at the market and, and some extra cash. it's all down to evan gardening, in spain, barcelona. it's hope gardens will promote biodiversity and improve the microclimate, but is going green really. that's and blue in germany, researchers are taking a closer look at green roofs, ah, green roofs, and some cities in germany. they're already mandatory for new buildings with flat

roofs. but creating biodiversity up high is not it still unusual to see a diverse mix of vegetation like this flowering be pasture. ah, the scientists of the institute for horticulture and fighting want to change that for over 30 years, they've been researching how roofs can best be greened. clear. currently replanting part of the area from now on lettuce and peppers will also sprout on the roof of the institute. dr. going o, as in victor, green roofs are important to help compensate for the ceiling of our sissy's. you everyone is talking about the loss of biodiversity, and here we have areas where many species can survive in cities and integrated on labor could cause laga, head of research and a green roof company. and horticultural scientist bound handler agree that there

must be more green roofs. the usual vegetation from the plant genus set them with its succulent water storing leaves is easy to care for and does not need to be mode or watered. but this permanent greening does little to prevent the loss of biodiversity, as indeed based on good policies. these are the best adapted plans. they can cope a drought and short term water logging on this yellow. so it doesn't really get much better than that. but the kids i positive things also have a downside wolfy list as the problem is we don't have the diversity we would like on the roof and off gum a head. you then in, in one of my sometimes called museum desert because it's quite monotonous and only has a few species. that's why we would like to see more, these diversity higher growing plans. so we're conducting some trials, sweat into tests. on the green roof, they progressively increase the thickness of the soil in sections from the 6 centimeters usual for settle up to 15 centimeters. the result with every centimeter

more more species take root such as the past flower that has just faded the euphoria which is in full bloom just like the county in the daily or the bergen. yet all this biodiversity draws the insects in these plans are thirsty or than the frugal set em, but more water also evaporates from their leaves. so as well as providing more biodiversity on city roofs, they cool their surroundings better. in the greenhouse sensors constantly register the temperature and humidity in the air and in the soil. 6 boxes are filled with different depths of substrate and planted accordingly. above a sprinkler system, the sprinkler simulate a rain event. the question which box cools best through evaporation and can store

the most water at the same time? because climate change is not just expected to create great heat, but also more and more heavy rain. the ceiling on the ultimate goal is to create a sponge city. the spot to really absorb the water, just like in nature with soil accent when we seal services a red building. so create parking spaces on the water runs off. we want to use it on site to also create evaporative cooling and ultimately a more habitable urban environment. better adapted to the freakish weather we're having to to climate change it often. the box with a settled planted on a thin substrate is saturated 1st. after a few minutes, the water over flows and so can't be used for cooling and irrigation. the other boxes with a slightly thicker substrate filled up after just under 30 minutes. only one stores the water much longer. it can rain for up to

a whole day without the box losing water the difference a construction that could mitigate the effects of extreme weather if installed on many roofs. this was on the radio is the special thing here is actually this retention element, this water storage element under the greenery busby door. crosstalk, so we can empty before heavy rainfall, but we can also retain the water and the element in order to keep the plants water during dry phases. we've also souffles alden in the future. data about the existing water reservoir will be fed into an electronic system link to the local weather forecast. the system will adjust the available storage when there is a risk of heavy rain and flooding. while in extreme heat, the water can be used for cooling. sinful, a seamless stuff, a meaningful goal is to continue to expound these areas and no longer cover them with grapple found on the dish. and instead cover them with plants that will have

a cooling effect on our cities. often crude effect, initially from hot if the roofs are sufficiently load, bearing elevated gardens or even real parks would also be possible. bringing more green into the cities and making life they're more pleasant. if i will let is read why i gave you. if you have a science question, send it to us via video text or voice message. if we answer it on the show, we'll give you a little surprise as a thank you. go on just dos. and from all from the world of science, visit our website. oh, join us on twitter. that's all from to morrow to day this time. join us again next week,

until then stay curious. bye bye. with

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ah ah, this is dw news lived from berlin a death told in the 10s of thousands in memory of paul and you cried. that's what ukrainian president, full of amused zalinski is saying after more than a month of relentless shilling by russian forces on the port city. also coming up, austria and chancellor caused ne huh. tills roches vladimir putin, that the war in ukraine must end. he's the 1st european leader to meet putin in moscow since the invasion.