it's now a call for greater democratic freedoms. our correspondent jonathan head has more. saturday evening in hong kong. another protest. but the tactics have changed. keeping one step ahead of the police, they have made an unannounced dash to block this busy intersection. the barricades go up with breathless efficiency. and then they wait. the police arrive, as expected, at dusk. they are charging through a barrage of tear gas. but when they reach the barricades, there is no one left. save for a solitary woman shouting at the police through a speaker. the night's events are only starting. we have now come down to the commercial heart of kowloon.

this is another location where the police have moved very quickly. they are blocking the road, there are protesters who have been surrounding the police station. all of this is happening very quickly. the police disperse them quickly but the protesters just move on. for the moment it looks as though they will pursue them down a side street. the tear gas warning goes up again. but the protesters have largely gone. in their place are regular bystanders in what is a busy shopping street — and they are angry. a young woman has just been arrested. that only fuels more anger. here we are not seeing protesters but ordinary people on nathan road, who have lined up to watch the police trying to take control. you can hear them shouting abuse at the police. this has been going on for the last half hour. the police don't seem to know what to do. facing another furious crowd...

..the police eventually retreat. but even now, the saturday night drama here isn't over. this is proving to be a tenacious protest movement. it's far from spent. if the government's hope is to wait it out, that wait could be a long one. jonathan head, bbc news, hong kong. now it's time for a look at the weather with alina jenkins. hello. we've had torrential rains, thunderstorms, and in places, damaging winds. the low pressure polling eastwards into the north sea so polling eastwards into the north sea so very slowly, the strong doubts. to ease down. still windy in northern scotland, outbreaks of rain

here and in northern england and northern ireland. to the south, drier, clearer skies, and the winds will by dawn. temperatures for most somewhere between ten and 15 celsius. our concern tomorrow is for some heavy rain through the central belt of scotland down into southern scotland, fringing northern england. to the north of theirs, mainly dry, mainly dry, too, for northern ireland. for england and wales, sunny spells and thundery showers. in the sunshine, 23 celsius, fairly cool where we've got the persistent rain. hello this is bbc news, the headlines: the disgraced us financier jeffrey epstein has been found dead in his prison cell while awaiting trial on sex trafficking charges.

national grid has said it will learn lessons, after nearly one million people across england and wales lost power yesterday. michael gove says there will be a government support fund to help british businesses in the event of a no—deal brexit. wet and windy conditions cause disruption to travellers, with the west coast mainline hit by flooding. the family of a 15—year—old girl missing in malaysia thank the search teams who are scouring the jungle for her. more than a million people are evacuated from their homes as a powerful typhoon hits china. now on bbc news, in a series of documentaries, we will explore how best we can protect our precious planet, exploring sustainable solutions around the globe and meeting the people at the forefront of driving change. how can we best protect our precious planet? climate change and pollution are taking their toll.

that much is now scientifically evident. but for all the uncomfortable truth, we hold the future in our hands. in this film, we'll be exploring sustainable solutions around the globe and meeting the individuals driving change in their communities. from housing to energy and fashion, these are some of the unique and surprising ways in which people from all walks of life are working to protect our planet. here in the winter, we can get waves up to 30m and that is a huge challenge, it's a challenge to survive in those extreme forces. the archipelago of orkney lies in the northern isles of scotland, where the north sea

and the atlantic ocean meet. it comprises of around 70 islands, beset throughout the year by winds and gales. about 20 of the islands are inhabited but its very location as one of the remotest settlements in the uk means it's an ideal place to test new forms of energy such as wave, wind and tide. wave energy is literally the energy in the waves but ultimately that's been driven by the wind. in orkney, because we've got the full force of the atlantic ocean, which is very windy, so we get a lot of very big waves crashing against our shores. tidal energy is driven by gravitational forces. where we get the biggest opportunity for tidal energy is tidal streams where there's a flow and that flow is concentrated around the islands in orkney and a few other places around the world.

orkney was once dependent on the scottish mainland for power but today, it fulfils its own energy needs. this tidal turbine pioneered by an orkney—based marine energy firm is being tested by seawater moving its blades. the technology takes energy from sea and converts it to electricity. the principle behind it is much like wind turbines on land. the wind turbine, the blades are being moved by the wind whereas in our tidal turbine, this seawater is moving blades and turning that into electricity through conventional generators. and how much energy does a device like this generate? right now, this turbine with the tidal speed that we've got at the moment, which isjust over 6 knots, we're producing 1.8 megawatts of power to the grid. herem locally, we are charged extra

for the energy we use because of the old system when we needed to take energy from the mainland up to orkney. it's not just the technology that needs to change, it's the market and we need some real disruption there to allow these new technologies really deliver what they can for local people. around the world, energy use remains a global challenge, which is why innovation in the energy sector is vital. we need to limit our energy use as we go forward. particularly as the world population continues to increase, the world's energy needs are going to continue to rise. orkney also has a rich archaeological heritage, so much that only a fraction has been excavated. for archaeologists like julie gibson, it is a race against time. in the last 50 years, we have about third of our archaeological sites eroding.

beautifully preserved and extraordinary as they are, on the one hand, and eroding into the sea on the other. so part of myjob is to try and keep an eye on these sites to see what character they have, what we're losing. julie has beenjoined by dr ingrid mainland from the univeristy of the highlands and islands archaeological institute to explore the middens, which are remains of ancient domestic waste that are being lost coastal erosion. we are sitting on the beach of dingieshowe, which is near the part of deerness. we're interested in some archaeology that's coming out of the cliff section. there is the remains of middens, fish middens and shell middens that are being eroded away by the sea. they are very interesting and very important because they tell us about humans' activity and human behaviour in the past. from the size of the fish,

we think that it's telling us that the site probably dates to the mediaeval period. this tiny place here up in the north of scotland was part of a vibrant trade in fish. it tells us about fishing stocks that were present in the mediaeval period and that information is relevant for understanding conservation practice today. this little bit of cow skull probably tells us what the people were eating themselves. so this is a viking norse cow from a thousand—odd years ago. we're losing an awful lot of information about the past. i feel like that there is some hope of having the interest of scientists like ingrid in these middens. the more information we can get, the more we can hang onto. you can't hang onto your ancestors but you need to know about them. approximately half of the world's

oxygen is produced by the world's ocean and it's the largest ecosystem on the planet. over 4,500 miles from orkney, conservationists have come up with a unique idea to protect marine biodiversity, turning 2,000 square metres of the caribbean into a living museum. with more than 500 pieces of art, this museum in the sea is the largest underwater art installation in the world. it began with just three sculptures as an attempt to attract tourists in order to relieve pressure on the natural reefs in the nearby marine park.

with more than 500 pieces of art, this museum in the sea is the largest underwater art installation in the world.

it began with just three sculptures as an attempt to attract tourists elier amado gil is a cuban artist who works with musa.

it takes about 3000 litres of water to produce just one kilogram of cotton textile. in fact, the clothing industry uses more water than any other, aside from agriculture. fashion is a highly resource—intensive industry, and the amount of clothing we consume is inevitably putting a strain on the planet. the pulse of fashion report, published by global fashion agenda, projects that by 2030 global clothing consumption could rise

by 63%, from 62 million tonnes today to 102 million tonnes. one company in sweden created a revolutionary way of repurposing old clothes into new materials for the fashion industry, in order to better protect the planet. for me, it has been a big motivation just to be able to go to work every day and feel that you contribute to making the world a more sustainable place. renewcell recycles cotton clothes sustainably by transforming old clothes into raw materials for the fashion industry to use. if you look at average numbers, to produce ikg of cotton textile, it takes about 3000 litres of water. ikg of chemicals. i6kg of carbon dioxide. and then it creates about half a kilo of waste. so it is a really resource—intense industry. so we leave big footprints. in 2014 the team created the world's

first garment made from 100% chemically recycled cotton. so old blue jeans became a new yellow dress. and with this proof of concept, this proof that the chemical recycling process of cotton actually works, we were able to build the first industry relevant chemical recycling plant in kristinehamn, sweden. it makes textile to textile recycling possible, it closes the loop on fashion financial fibres. and in that way, we can avoid a lot of the negative environmental impact associated with cotton or polyester. we are talking about reduced water use, reduce land use, reduced emissions, and reduced chemical use. and really making sure that we use the material we have already once grown and taken out of the earth, and put that back into high—value use, so that we take care of the things that we already have. the used clothes come from the storage facility. they are then shredded, and non—recyclable elements

like buttons and unzips are removed, before the clothes are broken down and turned into a fibre substance. we develop sorting technologies, promote new entrepreneurs and new usage of collected and sorted textile materials. other companies across the world are also working on technology to turn old clothes into new fibres, and some firms now offer vouchers to shoppers taking back used garments. there are several actions a consumer can make. everything from buying consciously, so when you buy, go for something that is long lasting. fashion that is produced today, ask a lot of questions in the store, where does it come from, how is it produced? that is where you can actually really have an impact on the brands. and then make sure you care for the clothes in the right way. so, whatever you do, there is an imminent need for people to express themselves. fast fashion is a good thing. we move around and we like to be unique and express ourselves.

clothing is a very strong status marker. we cannot sort of limiti million people to express status. if we can do good things about it, it has its virtues. you can actually take back materials and give back, which is a great thing. not every solution to our environmental challenges is ultra high—tech. meet the millennials fighting food waste by sharing food. see you next week! poppy visits cafes in her north london neighbourhood once a week. three large loads of seeded bread, and a focaccia. brilliant. it's something to do which makes me feel connected

with everyone around me, like the community that i live in. it makes me feel like i'm making a difference. i also get 10% of it, or one portion out, which is why i started using it in the first place. volunteers like poppy, so—called food waste heroes, collect foods that businesses would otherwise have thrown out. in the uk alone, 7 million tons of food and drink are thrown away each year. so, we have got white loaves. poppy uploads pictures of each item onto the olio food sharing app. locals using the app can request it for free and come and collect it. it attracts a wide variety of people. just finished school age people, through to, like, really old people. elderly persons. if i wrote something really good,

like fresh doughnuts or something, it's literally a matter of minutes. if people like the food they see, they message poppy and get her address. hello. are you poppy? yes. here you go. i am quite environmentally conscious. obviously food waste is a huge environmental problem. this is, like, the little bits that you can do that makes a difference. also it is a really nice way to meet people and feel like you're part of your local community. people are also sharing food they bought for themselves. if they no longer need it, they upload it. polish student kasha is collecting some unwanted ice cream. i think it's really crucial to fight against the food waste. also, i am a student, so this way i get free food. so i can spend £5 a week for my groceries.

olio is run from this london flat by a small team. it has over a million users in 49 countries, and more than 1.7 million portions of food have been shared on the app. but for the system to work, a basic human fear has to be overcome. food's a really personal thing. we have built into the olio app all the same checks and measures you would expect from any other sharing economy. users have profiles, they have user ratings, any listing can be reported to us. but at the end of the day it's up to you. you can choose to request the listings that you think look nice, and from the people you want to share with, and you don't have to if you don't want to. people looking after the food also have to be happy letting strangers into their home. unless they want to come and steal a lot of bagels, i'm not really worried, to be honest. i feel like, if anything, it means that i get to know the people in my community

and i feel more secure. on the other side of the atlantic this community is also opening its doors to strangers, as it embraces a bold new way of tackling the city's housing shortage. according to the oregon centre for public policy, two—thirds of the state's low income renters spend more than 50% of their income on housing. there were over 4,100 people on a given night who were either sleeping outside in an emergency shelter or in transitional housing. there are probably three times that many people on any given night who're couchsurfing, living in basements and garages and trying to stay housed that way. when officials here announced plans to build small living spaces in homeowners' backyards, at no cost to the owner, more than 1,000 people signed up to register. four were ultimately selected to be

part of the pilot project. the test is to work with four homeowners to build an accessory dwelling unit in their backyard, where families who are homeless can live for up to five years. and at the end of that five—year period of time, the homeowner gains ownership and access to that unit for whatever purposes they desire. known as accessory dwelling units, the homes are roughly 200 square feet. homelessness is a real problem in portland. and obviously in other parts of the world, too. and i would of course love to contribute. but how? i couldn't donate lots of money, because i don't have lots of money. but when i heard about the programme, and i realised that i have a backyard that really isn't being used for anything, totally unproductive, it was just a perfect fit. i saw an article in the oregonian, and then my good friend saw it online somewhere,

and she emailed me and called me and said, "martha, this is the perfect thing for you, this is just what you've been looking for, you've got to apply." so i did. sherry and sobeyda were homeless for eight months before moving into martha's garden. they lived in their vehicle and in shelters. it was scary at first because of the shelters, and because we were going from place to place. i feel like a millionaire. i feel like i won $1 million and everything is falling into place. a home, the stability, that's what i needed for her. i like books, a lot. i have my little library of them. i can finally put that somewhere where i can get it and nobody else can. there's a laundromat within walking distance, great public transportation, several grocery stores, daycare, schools, and parks. it's a really nice neighbourhood for sherry and her daughter, they're a perfect fit, i think.

they're going to work out fine. we really get along well. the pilot project took longer than expected, but if the houses are deemed a success, there are plans for 300 more. many times i think there is this narrative that homelessness is just an intractable problem and it cannot be solved in our lifetimes. i actually disagree with this. i think the response from the community says there's still stomach, there's still will. people just need to know how. across the world, there are people striving to provide sustainable and innovative solutions to some of our biggest challenges. high and low tech, large and small scale. they are working towards preserving the earth's natural resources and protecting our planet.

hello. some severe weather across the uk today. torrential rain, thunderstorms, and damaging winds whipping up the waves here in penzance. a gust of 80 more —— 84 miles an houron penzance. a gust of 80 more —— 84 miles an hour on the isle of wight would be noteworthy in october, let alone august, and we saw cuts and many inland areas. the low pressure pulling eastwards into the north sea so pulling eastwards into the north sea so gradually, these really strong doubts will start to ease down. it stays windy across northern scotland, south—east england, outbreaks of rain across scotland and northern ireland and northern england. more showery, to the south it is drier and clearer skies and

not nearly as windy come dawn tomorrow. winds of average strength and temperatures generally to 15 celsius. our concern tomorrow is for the rain across scotland, some persistent rain through the central belt, just fringing northern england, it could well bring disruption in places and it starts to gather through the morning through the central belt and down into southern scotland. to the north, mainly dry with spells of sunshine, the sunshine will extended in northern ireland and for england and wales a mixture of sunny spells and wales a mixture of sunny spells and heavy, thundery showers. windy and heavy, thundery showers. windy and the northern isles tomorrow, mainly dry with sunshine and extending into western and northern scotla nd extending into western and northern scotland but persistent rain in the central bout down into southern scotland, just fringing northern england. should be a fine afternoon for northern ireland, a mixture of sunny spells but heavy and thundery showers through england and wales. where you've got the sunshine, 22,

maybe 23 celsius. cool in northern ireland and scotland particularly where we've got the persistent rain. we start the new weight with these frontal systems starting to edge their way eastwards so the more persistent rain will slowly started clear by monday morning. behind it, we will see spells of sunshine before showers gather across northern ireland, the western isles and down into parts of wales and south—west england. it will filter further eastwards through the day and it is a cooler start to the week, which is a trend next week. sunshine and showers with the potential of persistent rain on wednesday. that's all for me. goodbye.

this is bbc world news today. our top stories... the fbi investigates as us financierjeffrey epstein is found dead in his new york prison cell while awaiting trial on sex trafficking charges. hundreds of people are arrested in russia as opposition groups march through moscow to call for free elections. police in hong kong fire tear gas as they clash with protesters continuing their calls for greater democratic freedoms. and coming up — tensions remain high in indian—administered kashmir after protests against the removal of the region's autonomous status.

hello and welcome to world news today.