this bike tour is for. the true. 30 minutes on d w. passion drama competition while marketing numbers atmosphere fight attack intuition love hate money 1000000 fans transferred strength and funds. on you tube. it is. this is. so is this. and this. although in on and above our planet amounts to about 1400000000 cubic kilometers almost all of it more than 97 percent is salty less than 3 percent is freshwater and most of that is in snow and ice in glaciers and in the arctic and antarctic so the amount easily accessible

to us humans is relatively tiny. it's in rivers and lakes and under our feet groundwater that usually hidden from view is vitally important. hello and welcome to tomorrow today the science show on d w. the vast amounts of water on our planet and sitting still but in motion in a perpetual cycle heat from the sun makes water evaporate and rise into the air as it condenses into forms clouds and eventually precipitation ensues in the form of rain snow or hail. some of that water evaporates again directly some is taken up by plants flows into rivers lakes and seas seeps into the earth. and replenish

since the ground war set some of that in 10 makes its way to the surface. this is the upper rhine valley in southwest germany. there are places here where something valuable and increasingly rare couples up to the surface. clear pure groundwater. pike feel right at home in it as do many other species of fish. some are facing extinction the european there's a critically endangered species. oh fish need clean water and groundwater is a crucial source of that. the places in this region where the water rising from the depths is so pure is not the rhine river itself but naturally occurring ponds fed

by springs. here the water temperature is 11 degrees celsius all year. the springs and ponds are important and need to be protected. it looks like they can be found anywhere unexpected holes in the ground even in the middle of flat terrain. but the groundwater that feeds the springs some of which ends up in the rhine river itself is the result of a complex process of rain that falls in the fust as mountains to the west and the black forest up plans to the east feed streams. or seeps directly into the ground through soil and wherever the rock is porous permeable or cracked and travelling down were. through sand gravel or other

formations it's filtered and purified while also picking up minerals along the way some of them of great value. when the water reaches impermeable rock it flows along the top of that layer and into the valley. if it feeds into the river it mingles with what was once groundwater in the alps to the south. there's a huge aquifer beneath the upper run valley. in the valley groundwater bubbles up to the surface in spots where the rock and ground are permeable. that's how such ponds are formed. in the clean groundwater many life forms flourish . pyke like the temperature and the oxygen and nutrients levels in the water not too much and not too little. here some male piker chasing after a female after a bit of

a song and dance one couple make. these pristine ponds are under threat. intensive farming means insecticides pesticides chemical fertilizers and slurry can all pollute groundwater. and thus the springs that feed the ponds. nitrate from nitrogen fertilizer causes al jewel blooms which use up all the oxygen in bodies of water. various chemicals are bad for aquatic animals and plants. they also threaten the supply of water we humans drink. the level of nitrate in groundwater exceeds the permissible level in more than a quarter of germany. groundwater to. there is nitrate and other chemicals down

into the valley. contaminated groundwater in danger's bio topes it's meant to sustain. where the ground water is clean it feeds bio tubes rich in biodiversity. lakes. read beds. woodlands and also manmade lakes. such as old gravel pits as they fill up with water life returns. to. a young great crested green biz looking for food. it finds a fish hiding in vain among the plants. dragonflies and damselflies thrive here too.

they all need clean water to reproduce like these common blew dams off eyes. a female heads down into the water. her male concert accompanies her. she climbs down the stock of a plant to make a hole in it and deposit her eggs. at this depth the egg should remain safely moist even if the water level drops. then she lets go and rises to the surface. a male helps her out of the water she wants to mate with her.

none of this would be happening we're not for clean water from underground sources it's a precious resource we need to do our utmost to protect. and we also need to protect that water when it's still in the ground. graham course it is in a way like the ocean depths mysterious little in the dark it's cold to me it may not be cozy but all kinds of weird and wonderful creatures live down there. they've adapted to the harsh conditions. they merit close attention they are fascinating and we actually need them as well. since time immemorial tiny creatures have lurked in the depths of our groundwater most

are translucent and blind and they're perfectly adapted to their desolate habitats where there's no light almost no food and little oxygen cancion hahn is a ground war to ecologist he's fascinated by these subterranean animal species which in their own as stick a foreigner. around waters the deep sea beneath our feet never been properly researched but it's teeming with exciting form of the play a key role in purifying the water. 2 and therefore the quality of the water we drink for millions of years that habitat has barely changed but now groundwater temperatures are rising and that poses a potentially deadly risk to stick a foreigner as hands you can han has demonstrated in a comprehensive scientific study. and from fish puts in simulators when they chew is still intact the ground water is well protected and its temperature remained stable between 8 and 12 degrees celsius.

temperatures dropped 10.8 degrees. there were searches find snails and worms and faults of shrimp like the fungus. creatures that live in the groundwater have evolved over millions of years to suit their environment they perfected the art of surviving with very little food thanks mainly to low metabolic and reproductive rates and eggs with an extremely high yo content to ensure the young survive. there are some 250 types of stick a foreigner in germany including them if august schellenberg it hasn't changed in 30000000 years and nor has its habitat creatures that can survive being groundwater have adapted to a severely limited food supply the water allows the cellars aquatic as' for example can go for months without food it copes by barely moving and expending little energy if august or belair ians and muscles feed on bacteria plant and animal

residue in the process purifying groundwater of organic matter and germs preventing tiny pores in rock surfaces from clogging up and allowing the ground water to keep flowing. speakerphone it can only continue to perform these valuable tasks if their habitat remains unchanged but now ground water temperatures are rising especially in urban environments do you part need to climb. changing partly to the fact that subways underground car parks and pipe systems heat the ground and therefore the groundwater. in the long run the tiny creatures of the deep won't be able to survive higher temperatures. temperatures such as here in cars who are the 1st point one degrees that's high. about 3 degrees too high but in many cities no longer unusual. for. the groundwater habitat

is clearly at risk but unfortunately green technology poses an additional threat to stick a foreigner. and then it's not in recent years as climate change progresses ground water has increasingly been used for geothermal energy either to heat or cool for air conditioning for example and that of course heats up the ground water this is happening primarily on the outskirts of cities and where industrial zones are being built a new developments are going out it's suddenly getting warmer in exactly the places where the former is still relatively intact. but perhaps not for much longer then the stick a phone i would no longer perform their vital role in purifying the water we drink it isn't always that into us and we know that microorganisms bacteria will change but there will be greater diversity more species effects the rate of growth will increase and therefore there will be greater challenges to the supply of clean water it will be harder to keep the microbes in check in our sources of water for

us us interests of our. more to purification in treatment plants will become harder and more expensive there is little awareness of this problem gemini has never set a limit on ground water temperature as there are no regulations on protecting subterranean fauna. a lot of attention is paid nowadays to protecting bodies of surface water but not to the infallible water beneath our feet. not according to e.u. law and also the german water resources lol the ground water is a body of water just like a broker let it go on its a college you must be protected as yet this is not happening it's seen as a resource and nothing else. that. the ground moves it is all most important source of drinking water and that's partly thanks to these tiny creatures subterranean for

now that time forgot. they deserve our thanks op protection. less than one percent of all the water on earth is in the ground so we should be careful what we do with it. in many areas of the ground water level is dropping because we pumped up so much of it about 70 percent goes to farming and a lot of the rest to industry. so how much water does it actually take to grow out the crops and make our kids. what is virtual water. let's take genes as an example it takes around 8000 liters of water to make one path that's $53.00 bathtubs full how come growing the cotton uses most of the water it's

a very thirsty plant if the rains fail cotton fields have to be irrigated. and if the cotton is to be spun into jeans it also needs coloring rinsing and bleaching that pollutes a lot of water. virtual water is the unseen water that goes into the manufacturing of our product. nearly 900000 liters for one kilo of coffee 184 liters for a kilo of tomatoes and over 15000 liters for one kilo of beef. in a country with adequate natural water resources high consumption isn't a problem unless of course a lot of it gets polluted but in many regions water is scarce or supplies have been depleted by producing certain goods the water level in the aral sea has dropped 18 meters because of irrigation in cotton fields it's turned parts of was back you start into a salty toxic waste land. tomatoes a cultivated in the parched reaches of southern spain using water piped into

enormous greenhouses. and in brazil where there's a shortage of drinking water the country's huge coffee plantations are never short of a dry. up coffee is a major export for brazil. europeans import beans water guzzling goods and by extension all the virtual water needed to produce them seen from this perspective someone living in germany uses free 1900 liters of water a day slightly over the global average but cooking showering and laundry make up only a small part of that most water used here is virtual water hidden in the products around us. water is a finite resource the fresh water is especially that useful and it exists in the petrol cycle like the rest of nature in carbon and nitrogen for example the atoms

and molecules that make up everything on earth have their origins billions of years ago. the cycle of emergence growth and decay is eternal and nothing goes to waste at least in nature but when we humans get involved it's another matter entirely. millions of tons of building waste and global oil producer around the world each year. much of it and up in landfill. but what if it were possible to transform trash into new building materials the walls and insulation in this house are made from plastic bottles tetra pak. and potato peel. the masters one of its many features. this is a test facility the temporary residence of students who are spending several months

here to find out what shapes up as 100. and feels good to know that you are living in a place that is going to be the future because now cities are turning to to mind and they are living in this environment with these materials and you know that you don't miss anything and it also provides you with fixed i mean to use. one man's trash is another man's building materials expert enrique marquez equals it in mining practically everything in this apartment is recycled over recyclable or is he not they also sort of our material resources on earth are limited. and that was all meant to be i mean there's only so much copper building sand and so on that's a fact so we're slowly reaching a point where there's not that much left we need a solution and the only one that works is

a circular economy and yet the shit out of it off hand they so for example the rooms are fitted with carpets that a manufacturer can later take back and refurbish into new carpets small was then called if that they picked somebody you don't buy the car big you just rent it because the manufacturer will want it back at some point so. they already have it seems most of the materials here can be fed back into the system so that the same product or something different can be created from the owners with into the piece no stills. but to maintain this kind of cycle the buildings need to be designed in the right way. that all of you have to be able to disassemble the building into its individual components that means everything can be just connected it's all they are screwed or slotted in and. with all that i like to exaggerate a bit and say it has to be possible for 2 people to take the entire building up argue with just an electric screwdriver or fold and no way that. this bronze door

handle once belonged to a bank that was demolished these kinds of high quality components often go to waste . a swiss online platform now sells building elements from demolish buildings for very low prices. it was found by architects alleviate pain. in the shrine so. we have around $3.00 to $4000.00 demolition permits a year in switzerland so more than 10 buildings are torn down every workday lives. and it's really surprising what gets demolished. buildings that were completely renovated just 10 years ago marked for demolition. and you ask yourself it's not normal this is not really the way we should be

proceeding. the online platform has a diverse clientele some of the items listed on the site and brewery in switzerland . it was a stroke of luck for architects bastian told around. this official so i just searched the platform for a window to get good food and i found these ones these are photos of the original building the windows i wouldn't frames. i bought 25 of them for hardly anything because they would only have been thrown away otherwise. a. whole book festival because you know what about that i use them for this partition wall and i. have a brother. still very few components like these that recycle storage is a problem also not everyone in the construction industry is convinced. although there are already countless extraordinary example is about cycling around the world

. recycling not yet common face and construction. these building materials are available and affordable so why don't more people make use of them. as it's about taking the plunge in a place we notice that people are just unsure of because there are a lot of unknown factors like legal and planning aspects in the way it's been on the blog and as is often the case if something's new then there's uncertainty. uncertainty holds you back and we see that as the biggest reason we don't wish. other countries have made more progress like the nothing and these bricks are made of waste products they're manufactured in this old brick yard south of upside down by hand just as the conventional brick seems to be.

the main product of the startup. she already has a beautiful colors it doesn't necessarily look like waste any more. the bricks are mainly made from shredded building rubble and industrial waste. another funny one. that also tells like a nice story is. so what i'm holding in my hands used to be toilet vaults sayings tiles like a kitchen or a box room tiles. the market for them has grown by life for the past year although these particular products are expensive sales are improving. so this is the sold of pepper there's just there's the middle one is you know gosh this is the salami. but it's always a combination of just this idea of just an ability combined with the side i think

people really like to buy beautiful things and it's it's a win win if it's sustainable and beautiful and india nobody wants a building even if it's sustainable the colorful bricks cannot be seen in many new and renovated buildings across you know. the netherlands is a pioneer in such you know economies the country wants to recycle all of its waste by 25th state and it's aiming for 50 percent by 20 fastly now bishops pound. i think it's only one solution to speed up the transition to a circle our economy and that is just. make it policy and policy in terms of tax incentives so that's a nice 1st step but actually starts handing out penalties as people don't use reuse materials for instance seed to meet the time for change is now it makes sense and

people know it and it won't cost a great deal it'll just take time and our construction industry has grown to what it is over the last 150 years it's the world's biggest economic sector. it's not something we can change overnight the a tough tweak sensitive data but it does need to change so you know both of them like all resources are running out. if outlet is right why. robert latham even if you do you have a science question you'd like us to answer. send it. to if we feature it on the show you get a little surprise as a thank you. come on just ask. you'll find us on the web at g.w. dot com slash science or check us out on twitter.

that's all for now thank you for joining us. morning grossing stories about science and technology visit our website. we'll be back next week with a fresh edition of tomorrow today. until then by. all

. means. on. a bicycle and one. today i want to find out why the result is one of the most beautiful river states in germany so i'm also right along a part of the old psychopath. the beautiful landscape is certainly.

this bike touring just for connoisseurs. change is. coming up on d w. genuine diction for. photo editing software distorts what is real. the possibilities for an. endless. is the new truth. 20. 30 minutes. it was the 1st international tribunals. the number of trials.

75 years ago a high ranking officers of the nazi regime were indicted by the allied forces. they were the 1st war criminals to be held accountable for their crimes. our 2 part series. in the dark starts nov 12th on d w. each session for spectacular pictures. it's their passion for nature please. it's their complete devotion that makes them the best wildlife photographer in the world. please. say something. and don't let it. confrontational and start. the fun of adventures.

one goal. the preservation of our planet. it's not as if it's your garden trees and sitting cabinets anymore. it's ours it's in danger of surviving an os right through to realize that there's a radically different way of living it's from brother please mention for china starts november 6th on t.w. . this is day w news and these are our top stories u.s. president donald trump and his democratic rival joe biden are making their final pitches to voters ahead of tuesday's election trump held rallies in 5 swing states while biden focused on the pivotal state of pennsylvania a record 90000000 early votes have already been cast as the contest heads toward

the biggest turnout in at least a century. and bella has a fired warning shots and used to.