underwater there will never have on land. and the complex interplay it gives rise to is incredibly fascinating complexity is it is absolutely trusty. marine eco systems are flexible but only up to a certain point. and human beings have had a major impact on life the need for the way. microorganisms also react to changes in the oceans and that can send ripples up the food chain. the researchers are trying to find out how plankton communities respond to changing conditions. in the warmer the water grows the faster bacteria reproduced. that leaves fewer resources for other tiny life forms. the researchers are trying to establish a kind of early warning system. at what point will

a major die off become unavoidable. and then give the bottom up that she wants while if we continue producing this much c o two and we will then of course acidification will only get worse the planet will warm up other stress factors will play bigger roles we can only hope that it happens slowly enough that marine organisms are able to adapt to. more of the oceans of the future look like. the marine researchers from northern germany are looking for ways to predict the possibly fatal consequences of climate change for the sea. we are just on facebook if you tell us they do anything to help head level warming. just french of their it doesn't treat yourself to new cars and he cycles a lot he also only uses twenty. liters of water to shower impressive.

sodger tambay there is also setting a good example of his planted lots of trees around where he lives and plans to continue. you often came to new ones to invent a machine that produces electricity so it can run off its own power that would stop harmful gases from getting into the air it's a nice idea you ask him but unfortunately it violates physical laws. so what can we do to put the brakes on climate change. well the obvious solution would be produce less c o two. but what if we could take carbon dioxide else of the air. researchers in switzerland are trying to figure out how.

this operate is this twelve metres long two metres tall and four metres wide it's one of the world's first devices for recovering a valuable resource carbon dioxide. the machine resemble six old fashioned air conditioners in a row it functions as a kind of filter to capture climate warming c o two right out of the air. developed by researches in zurich the collector may soon be used as a model for others like it all over the world. the engineers and technicians are constantly tinkering with the recovery process the machine can currently capture up to a ton of c o two per hour. for yam votes but her energy efficiency is key since that ultimately will determine the system's commercial success here. they are also out on the big challenge of getting c o two out of the atmosphere is that

you have to move huge volumes of a year to recover a single ton of c o two you have to pass two million cubic meters of air through a filter if you that's a lot with classic filter systems you end up consuming a period a large amount of energy just moving the air through. the filter contains chemical substances called a means. they bind c o two at normal temperatures when they're heated later on they release the greenhouse gas again. that's all happens in this collection unit. it sucks in air and directs it to a filter which is coated with a c o two absorbing a means. once the filter is such aerated it's heated to one hundred degree celsius. the c o two is then uncoupled

from the filter and is collected as a concentrated gas. the prototype has been in continuous operation for the past three years so we're standing here and this is the suction of fire but i c o two collector on this side the ambient air is sucked into the filter. definition of in the filter is located in this white box the air flows through and the c o two in the air binds to the molecules on the filter surface through the water cooler. of these and the air comes out again here of the search through by the pharaoh you. get off to if we measure the c o two here we have less than half the normal amount of c o two in the year. and the rest has been bound by the filter. here you can see the air stream. the collectors are mounted on the roof of a waste incineration plant the operators use the surplus heat from that combustion

to recover the c o two from the filter without having to pump extra energy into the system. from here the gas flows into an underground pipe that takes it a few hundred meters further along to a green house. tomato plants are grown here over a thirty seven thousand square meter area. in a c o two rich environment until now grow if it's my i had to order industrially produce the o two by the truckload now it comes right out of the pipe. flung to the made by offering the takes out more c o two is stronger a stronger player is more resistant to diseases in the past so that means we need if your personal insults me and the plants give higher yields of me to fit all. this collector alone removes nine hundred tons of c o two a year from the atmosphere according to its co-inventor. he's proud of

that result here. i'm i one collector extracts around the amount of some notes in from the others fear of a minute by twenty to thirty cars material. that's not much could devices like these really make a dent in global c o two emissions. ramdass my voice you're right and we did a calculation supposing we were to filter one percent of global emissions out of the air then we'd need seven hundred fifty thousand of these container modules each with six you know two collectors that's about the number of containers that pass through the port of shanghai and two weeks so it's a relatively small number compared with global industrial volumes clearly even millions of these collectives won't solve the problem of global warming but they could make a contribution and they pull the recovered c o two to be put to use as

a valuable rule material. you'll find most stories from the world of science and technology on our website to get in touch on twitter and facebook we'd love to hear from you. that's all for today next week we'll be heading for the rain forest in borneo researchers have developed a way of measuring the title of a city that join us for that next time on tomorrow. but i think our. our. the first.

to. enter the conflict zone a new president has taken the oath of office is involved when. you come from the old one my guest here in london is a mixed bag one of the u.k. representative of the country's ruling zanu p.f.

party with thirty five years of bloodshed only on the call only to prove he was told business today are continuing to government. troops w x. yeah. and i think one day this moral be considered cruel and unjust war abroad. and certainly all citizens of ukraine every man woman and child the only friend their homeland is the enemy invades. no one wants russia here and all mr new questions is that it's. a missile against global news that matters. d.w. made for mines. unimpeded access to education and knowledge and the same opportunities for everyone. a central goal of the global community but what's the reality on the ground in education for all the w's multimedia special remakes

personal stories and highlights extraordinary projects the world over to find out more on the internet d.w. dot com education for all. are you up to speed on the latest technology. go then it may be time for an upgrade this becoming part of the future. become a cyborg i must say works so i've created a new sense and i knew our guns and design my perception of reality implants that make every day life easier. i use my camps on a daily basis that optimize the human body and connect people more effectively. i hope that this would make us work at the person's what would life be like as a site for. folks who at the end of the day these technologies can be used against

us and what effect will it have an society does this human race move to upgrade i think it's only the beginning of this cycle just schuman machines starting february first on t w. this is the news live from berlin violent protests spread across tunisia anger over government imposed price hikes. one person has died and more than two hundred people have been arrested as authorities crack down on the. us also coming up on

the conservatives have until the end of today to strike a deal with the social democrats in germany could face new elections but the most divisive issues still lie ahead and time is running out. and a desperate search for survivors after mudslides tear through coastal towns in southern california at least seventeen people have died and more are still missing . good to have you with us tunisia has been rocked by a third night of violent clashes as on rest over government imposed price hikes intensifies riot police have used tear gas to disperse protesters in the capital tunis and four other cities one man has died scores have been injured and more than two hundred arrested the prime minister had warned rioters to expect a heavy security presence on the streets. even threats of

a clampdown to keep them away hundreds of disaffected tunisians clashed with riot police and another long night of violent unrest with both sides trading tear gas and drops some coming off wash from where. i was trying to talk to one of the policemen and suddenly one of them at me was his boss and. seven years ago it was the cradle of the arab spring after a revolt against rising costs that revolution made no be history but its spirit and its calls lives on. for many in the rural heartland economic frustrations confusion go hand in hand. there was no no no you couldn't put a lot of them because i don't think we had to endure these clashes after a day of work you know even our boss was attacked with tear gas. we need to find

a solution for youth politicians raised our living costs but why don't they take a peak and we have to suffer taking two buses to the factory town just a hundred euros. earlier this week one protester paid with his life and dozens more have been injured as economic hardship leaves its mark on. for more on the story let's bring in simon speakman korto a freelance journalist standing by in tunis simon the economy has been struggling for some time now tell us more about why we're seeing these protests erupt now well our building for some topping really many. issues right in the never. i'm principally the. business carnac i'm sure if you design a piece about that. when you get other areas that it gets rid of i think that we may hear it since the revolution so you have

a groundswell of anger over successive governments not just on the dresser and out with the budget i think people are really getting very or. what exactly are they demanding from the government. well i think principally they would like the government to look at the budget and if you again. i'm going to use it does. this international that that it needs to say this but people feel rightly that paul wrote in the most of it the government is if you stop plot sites and such they can go to our show get into that you can tell it which means that in real time it's. a great portion of that income the rich ones who can afford it. and that the result of a hugely. unfortunate has over into quite considerable bars and i mean are there

some looking at these protests and the outbreak of violence you know it's been seven years since the areas bring revolution was launched in tunisia what has changed since then and what has not. well i think in these immediately following the revolution we saw a great loosening of the policy and of house republicans to help people to account to see some kind of justice i'm probably progress towards a more european stop look at least experience and unfortunate same time we also saw this huge surge in terror and. in terms area and it was really under the auspices of this the government to. chip in or rein in revote us a many of those reforms security law the security services and i sat with him both of. the reconciliation act with this. i mean this is the officials because of

corruption all would be accused of corruption that they claim to know about and to build the economy.